Two hours looks about right for an average. While it's great that everyone gets paid (heh, wouldn't it be nice if that could scale to say... architectural comps or ad pitches), saying that $2.50 is a lot in some countries is just a bogus argument. So what if it is a lot of money to some people? Did you specifically seek out designers in developing countries? With graphics software, broadband, and 2 hours of free time to do little design jobs? That part seems sort of silly since the point of your post is that it cost virtually nothing to you.

Now, I wasn't being sarcastic when I said that I'm glad you've satisfactorily solved your problem. Further, I'm glad that everyone you contacted got paid. But that doesn't address the problems which I see, which are that 1) it wasn't a very business or worker friendly (yes, in my opinion) move and 2) I think you could've done better.

I looked for designers willing to take $5 in exchange for logo design. These were people willingly and publicly advertising their service. I didn't pay attention to region at all. I looked at the portfolios and if they weren't horrible, I hired them. Just because it costs nothing to me should have no bearing on this discussion. Do you get upset at Bill Gates for paying retail for his coffee at starbucks?

business/worker friendly: I think it's hard to judge. I had an outsourcing company in Indonesia once. The salaries there, if they could get constant work for $2.50/hour they would have better off than what we were paying.

done better: probably. I invested $30. I hope there are better options. How much money and time they would/will cost is a different matter though.

I actually had a free one designed by a really talented guy here on HN, but it was for a different brand name that we didn't end up being able to use. (If you're curious: http://kevinohashi.com/sites/default/files/mention.png)