Ohhhh...we can create player corporations? Wow, that is great. I have done this in the past on forums and it turned out to be really fun.
It might be a way for me to get back into the swing of things and contribute to fleshing out the background and under-appreciated parts of the setting. A sci-fi empire does not just happen in a day after all, it takes lots of little moving parts not always as glorious as a spaceship or a mecha armor, but might be just as valuable.
Since you mentioned it, I like the idea of running a transportation service that operates buses, taxis, shuttles, etc. Like the Greyhound of Yamatai. A great insert into stories where characters might be traveling off duty or to visit family. I bet there is room for military subcontracting in there somewhere too for logistics support, maybe even some kind of UPS-like service for important packages/baggage delivery could be done if it's not all government run.
I'm not so exceptional at beauty salons, but could also handle clothing and jewelry, but I might be able to make some kind of department store chain (ala JCPenny) or maybe a boutique setting/gift store. I suppose that comes down to if I am creating items, or just facilitating a setting for others to enjoy that style of RP in?
Lastly, I think I also find the idea of a laundromat very very funny. Who knows whose' dirty laundry could end up there.