Well mostly I've found the antique dealer to be not that useful so far. I've fed it with all kinds of junk but bought very little from it (sleigh builders when they show up once every two weeks or something like that, 2 pillar upgrades in one of my cities that had been running a level 5 pillar). The new items will at least give some chase aspects to it though. If I had to guess, the additions are not because the antique dealer is wildly successful - rather the opposite where they feel they need to add a bigger carrot to it to make people actually use it.
As for updated several times, I wasn't aware of such - but I quit for a while just as antique dealer was hitting beta. And returned just for the hallowe'en event on live in preparation for GBG which was a feature I'd intended to return to try out. In short though that means it hasn't really been out that long at all (3 months or so), and any adjustments so far could just be viewed as tuning a feature considered new and not having the impact they hoped for still (similar to the overhauled OP ygg tree just before the second settlement was released).
When daily challenges came out they too gave an alternate route to get stuff that had thusfar only been available in specific events and the potential rewards represented a fairly near to peak level of power at the time (having prizes from less than a year earlier at the time). Arguably much closer than antique dealer was at its release. Seeing as it had fairly recent event rewards, people did kindof expect that within a year there might be new chests representing more recent event rewards. Those updates never came. And by now I imagine most longtime players ignore daily challenges (though they'd still be of significant value to newer players).
They were not just a replacement for treasure hunt for mobile players. The combination of incidents, challenges, and people not using treasure hunt all that much anyways (and it not being on mobile) while the features served the same sort of role of something to encourage multiple logins a day led to the retirement of treasure hunt however.
This is a general pattern with features inno develops (GE as others have mentioned has prizes that really only feel like antique dealer fodder by now) - it seems very appealing at first. It might get updated for a little while. Then eventually it gets left to be what it is for a prolonged period while they work on the next new feature until it either gets overhauled or scrapped. There is *zero* reason to believe the antique dealer will be any different in this trend in the long run. Adding these two new buildings to it will add some excitement into it that it's been missing. People will be satisfied with it and stop asking when ____ will be added to it (because the art exhibition is better than ____). And a year from now it'll be another feature most people ignore because events will have power-creeped further and the antique dealer's rewards won't be that special.
This is one of most composed and thorough responses I have ever read. I cant really fault it, maybe I dont know enough about programming and development, how much time and financial cost goes into it. I had always considered those things GE, DC, would be changed when it absolutely needed to be, but not before.
I understand that maybe it won't be changed at all, maybe it is the end of the road for those aspects, but in my head it doesn't seem like a hard thing to consider and tweak for Inno. That is probably down to a lack of personal knowledge and insight.
I'm not sure if they want to just make money or if they also want to make a good game, but it seems to me, that so far they have achieved both, maybe not enough of either for them to be satisfied, but I dont know their outgoings when compared to their income.
I think the AD has become less relevant to most players purely because the items they most desire are no longer affordable to most of us, even the long term players will have run out of valuable items to sell, I just dont see how Inno were motivated to add these buildings purely in the hope of increasing participation; if the fall in participation isn't a result of disinterest and rather a result of us being unable to interact with it at the same level as when it was introduced.
I'd thought maybe it was not to entice but to avoid adding something too soon, when everyone had lots of currency. More to maintain interest rather than provoke it. I've trained myself out of cynicism and perhaps this is a blind spot for me.
Thank you for your considered reply, it means a lot to have you back on the forum, I've always enjoyed your posts. I'm surprised though you haven't found the AD useful, it has changed things for me immeasurably, increased my Cider Mills from 4 to 9 (+47 fp) increased number of cherry gardens from 5 to 9 and made half of those buildings level 2 and it has been useful for WW in my other cities. (I said immeasurably, but then immediately was able to measure it, so, that's embarrassing.).
I think if you hadn't had the break, you would have felt more of a benefit from AD. I do like taking a break from the game. I give myself a holiday from it every July and I might start to do it more regularly.