I think everyone agrees that free hosting is not going to bring profit but more of aheadache.
But it will bring awareness to your hosting/reseller site like your thread reads

People who maximize your free resources will most likely choose your solutions for hosting if they have good experience free.
PS: If you start something like this then close it down like alot of freehost do or they restrict/lessen resources lateron, something like that can actually help decline your business. Be careful.