Commercial tor offering?

[OgnenD]

Hello,

I am sure someone had digested this before but what would be some issues with 
purchasing (say) twenty different boxes around the USA with good pipes and 
allowing people to use them as tor relays/exit nodes (while charging a monthly 
fee for it)? The way I see it, greatest obstacle to using tor every day is 
speed, but I might be wrong.

Thanks,
Ognen

P.S. My apologies if this emails is duplicated, I had some emailer issues.