- Begging
- Offering services for a low price
It's probably because people think it's a cool idea. Human beings like to be a part of stuff. It's fun.
It depends on what you consider selling yourself short. Being part of the movement is incentive enough for people to participate. I doubt anyone is expecting to make a living off BTC at this point.
Not everyone is participating in BTC for the sole purpose of making money. Some people look at BTC as a viable currency. They want to experiment with the idea. If BTC is ever going to take off, we need people to sacrifice a little to further the goal.
I agree with this. But you have to consider what YOU think the value of services are. Profit isn't neccesarily the goal with everyone. Merchants in the market are performing the job of legitimizing the currency. This may be more important to some than making a fast buck.