Yea... but this was kinda potentially busted. I never got around to it, but I had the plans in place to make grotesque amounts of coins - 3 or 4 billion, pffft!
I actually looked the other day at what it'd require to make a theoretical petacoin using this interaction
(~10k coin boost potions, 10k coin rushes, and enough stores to convert to a city (mostly) full of SAT lv 1 abandoned asylums - or a bit more stuff if using ice dwellings.
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I would've hoped though they'd fix the technical issues for the extreme cases rather than stop reasonable amounts of the fun though. i.e. create a coin-cap we're unlikely to hit and anything exceeding said cap just gets lowered to said cap. So my petacoin theory might get stuck in the teracoins
Or at the very least have the limit for boost potions significantly higher - i mean they encouraged people to get cartographers that mass produce buccaneers and now any more than 10 buccaneers will make more coin boosts than you can actually use. Kinda a bait and switch there.
And then there's the single military potion limit - so the *hundreds* of them we have from anniversary and soccer are now basically useless instead of a kludge to allow you to fight GE5 a little earlier than you otherwise could (and i mean you still need some attack for defending army - so it's not like it was a total solution).