If it was that kind of money. I'd buy a place and make it into a hobby and card shop. I'd have tons of space to host events and put it smack dab in the middle of a place that has no business with hobbies or collectibles just because that's why I never grew up having one in my town. (I wouldn't have to worry about it not making any money, because I'd only do it if I had an obscene amount of money to blow anyhow)
I'd buy the lego set and hire my friends to help me build all the shit. I'd probably contract general steel for my gaint lego set storage warehouse needs. Place it next to the card shop for promotional reasons and provide free admission.
If I just had some money, I'd buy
this for sure though. (after getting a PS3 of course)