I used to help out with a free host about 3 years ago but they shut down. . . they were making pretty good money. I dont think google AD's would make that much to be honest but if could set up a good banner system it would surely real in the $$ - And ofcourse what starts out as free hosting can soon become paid hosting if you offer upgrades and features aswell as normal paid packages. . . . i've always seen free hosting as a good way to attract in potential customers and make money at the same time although as the saying, if your planning to be big it takes atleast 6months to break even in hosting so you would need some fundage to begin with