I posted a question on justask>Law, got a quick response, replied for a follow-up, got that, and then, just to see if it was a rip-off, said I was unsatisfied with the response (the response was great, actually) and got my money back no problem.
Tip: to make sure that your $ goes to the expert, choose the lowest priced option, keep replying until you're satisfied, then click the Happy button and give them a tip in line with the value of the advice.
I went back on and posted a simple question to the same expert and paid him for his time.
I have to say that this is NOT a scam. A scam would NEVER give refunds without difficulty, as in my case. I suspect that other posters might have mis-clicked, not read (it's easy to overlook that you can ask follow up questions until you're satisfied, for example, ) or didn't like the content of the answer, rather than the quality. gain, you always have the option to re-post your question to another expert...
I was suspicious, but satisfied. If you're unsure, get a debit card from your bank w/ only 10.00 on it or something and try it out. minimal risk, and the advice (in my case) was worth the cost.