Oh sure, but $200 is not worth the accounting / liability / legal hassle. Plus it depends on the problem. If it's a tricky problem that wants me to solve some

Oh sure, but $200 is not worth the accounting / liability / legal hassle. Plus it depends on the problem. If it's a tricky problem that wants me to solve something that they're trying to solve (I've had that happen a number of different times), than I'm not just putting in 2 hours. I'm providing them with the wealth of my entire experience.