Yeah, I went through the same exercise with developing a product in this field and went through all those links and used it as justification of how an Evite kil

Yeah, I went through the same exercise with developing a product in this field and went through all those links and used it as justification of how an Evite killer is possible. All those links end up talking about the same 2 things over and over again: - ads on the invites - email bait you to visit the site Great, but that's how they make money and they've been profitable with a small staff for a long long long long long long long long time. Most of the other invitation sites focus on niches, Renkoo on the concept of friends getting together, Crush3r on hipster stylings, MyPunchbowl on coordinating the whole event, Socializr on being a social network, so on so forth. Besides Facebook, MyPunchbowl is the only other service getting quite a bit of traction. But it ends up being the same concept: single input info, multiple output info. I really believe this is a game of user conquest and attrition. Without the momentum and money to stay in the fight for the long haul, Evite (which has already been genericized) will just keep on chugging along. Either way, good luck with the site and I'm sure you're much smarter than me at figuring out how to make this work.