You are outmarketed, outreached, and out muscled in almost every conceivable way.
Also, as much as people DON'T admit it - people play poker to win money. If you think your niche is those "friendly college games" well why in gods name would your "college friends" play poker online when they can kick back some beers, invite friends over and have a REAL game?
Lastly, if your angle is "social networking around poker" well thats called "every other poker site out there". I can not see anyone who is legitimately interested in poker, signing up for a social networking site about poker, that does not let you play poker "seriously" (read for money). I just can not see any possible legitimate angle to go forward with this.
Please someone show me the light.