Agree with the comments about raising price. And your notion that you may be targeting the wrong people. You're already much less expensive than BaseCamp (let alone enterprise tools). But for people who want a hosted version, that won't matter. BaseCamp isn't that expensive.
Think of it as being like BaseCamp, but with complete control of the data. It's a feature, and to some people, it should be worth more.
Your pricing plan of 1/2/Unlimited Users doesn't really capture this. The plan before unlimited should probably have 100 users or more. That way, larger customers who want to control their data can pay the right price (and feel more comfortable doing it, as @patio11 has pointed out-- you can be too cheap for people to buy).
Think of it as being like BaseCamp, but with complete control of the data. It's a feature, and to some people, it should be worth more.
Your pricing plan of 1/2/Unlimited Users doesn't really capture this. The plan before unlimited should probably have 100 users or more. That way, larger customers who want to control their data can pay the right price (and feel more comfortable doing it, as @patio11 has pointed out-- you can be too cheap for people to buy).
Good luck!