Decent ideas for the most part. Mini games and multi-tiered bases may be a little far reaching.

I think the advertising concept is interesting...Perhaps buyers could pay a plat or two to subscribe to auction notification system. When an sought item is listed for auction a "An Alien Melter 4500X is available in the market!" flashes on your screen. First come first served, right?

I'm all about gettin every drop of your money's worth from exp pots and being able to hold a certain inventory of them for use-on-activation would be great. Although luxurious, not having the timer ticking away while you're in a base seems like a fair idea as well.