If I won the lottery, I definatly would, though, first I would probably buy the entire stock of a hobby shop just for myself :D
But I'd open a hobbyshop just for this kind of hobby, models, not the generic kinds you see. Itd have a nice sized section for each type, like we have on the forum, as well as linked online store for the store inorder to reach a broader market. I'd have events in the store, like classes on how to build, those things where kids come in, buy a kit, and build it right there, competitions, all that nice stuff, to drum up support for the store. I'd also try and make some kind of deal with some of the AM resin makers (figures and the like) to havem in my store (that normally are online only), and I'd only keep the top notch kits, no junk.
You ever go into a games workshop type store, see the tables there with people playing? I'd do that kind of thing, have benches near the front of the store so that people could work on the stuff they bought there if they wanted, as well as letting me build while at work (cause who wouldnt want that?) Also I'd offer a small discount to anyone who brought in Finished models purcased in the store to be displayed in the store, sort of as advertisment, sort of to let the modelers show their work to the public, and to show others what can be built. On that note, with the kind of money I have, I'd comission armorguy for one of those 1/6th scale R/C tanks. Nothinwould draw in buisness like one of those driving dwn the sidewalk.
Last thing (I think) If you want buisness, and if you hit the lottery, I'd get myself a big enough store, and offer to host the local IPMS at the store, thats a way to get buisness Ill tell you what