I think it could go much faster than this. 1000 users per day is peanuts. For something as groundbreaking as this, we should be hitting 10k+ per day or 50k per day. I guess we must find out why this isn't happening at that pace.
(Ok my expectations are high, shoot me :P)
People think it's a scam because even though they have nothing to lose. But as their friends start using it and show them how real it is, they'll get here too :)
I guess you have a point: It's so good that it's unbelievable... triggering "too-good-to-be-true" reactions.