Wouldn't it be cheaper to use the SAM goods (i presume it takes to build the Star Gazar) to trade down and get 8,192,000 IA goods (per 1000 SAM goods).
If you can? You generally can't trade down at 1 current age : 2 previous age in my experience. People just aren't interested in taking the other end of the trade in any significant volume. You might want a *little* of your new age goods as soon as you age up and be willing to pay that kind of premium. Or you might be a quester and be happy to trade up your unrefined goods you have no intention of refining. But matching the person actually willing to trade up with the person looking to trade down in volume is not something that typically happens by guild or by neighborhood so you have to find the right friend. And the last step where you're trading your current age goods for previous - if you could find the trade partners for that regularly you'd not need to get the mars goods in the first place as you have plenty of ways to get current goods. I used to offer 1:1 iron for bronze age goods in my permanent-iron age world and it tended to take quite some time to get takers.
I strongly recommend people buying goods get the goods they actually want rather than the 'better deal' that involves them spending weeks trying to find
As such if someone really was planning to camp an age indefinitely buying a star-gazer once to cover their previous age goods needs indefinitely would be a pretty convenient option. Not the most efficient by any means, but not needing to play trader ever again could be enough to make it appealing.