(Wow, I'm really spamming the board today...ah well).
My local gym offers spin classes and has nice spin bikes with SPD pedals that work well with my cleats. That's nifty, but they lock the spin room when they're not giving a class! It's rainy outside, and rather than shelling out money for a good fluid trainer and taking allen wrenches to my bike I'd rather drive the 2 miles to my gym and use their trainers.

Does your gym lock the spin area? If so, why?? It shouldn't be an injury issue; I signed the "getting off your arse is dangerous" waiver, and the pencil-necked geek in the back room attempting to squat an aircraft carrier seems more risky than a dude on a halfbike. Theft? It's not like I'm gonna wrench off a dura-ace rear derailleur from this thing.