I don't do Mechanical Turk, but I've worked online for years and had a corporate job previously.
I made about $100/day at my corporate job and at least $20/day went towards costs involved in having the job. I don't have that kind of overhead with the work I do currently.
Freelancers don't charge $8/hour, but it's not at all hard to google up "client from hell" stories where they spent so many hours trying to get their pay that it was only like $2/hour by the time they were done or they didn't get paid at all etc.
I don't really want to argue this. Someone asked a question and I answered it based on first-hand experience making often nominally low hourly pay. And now people are nitpicking my reply, presumably because they've got relatively cushy lives and this type of assessment is alien to their experience.
If you make $100/hr at a salaried position, like a lot of programmers do, you probably don't need to think too hard about "But after my commute, etc, what's my real hourly wage?" If you make a lot less than that and want to survive, you absolutely need to think about "But what am I really making after x, y and z?" And the counterintuitive answer turns out to be that a nominally low hourly rate without a whole lot of unbillable time burden, like a commute or chasing your pay or looking for work, can be far better in real terms than a nominally higher hourly rate with a lot of hidden time burden or other costs.
Something I wrote a while back:
http://writepay.blogspot.com/2016/03/the-value-of-not-chasin...
If your life works just fine, good for you. But there are clearly many people willing to work for Mechanical Turk for nominally low wages. I'm sure every single one of them would love to have a higher hourly wage. I'm just trying to cast a little light on why people do this.
Everyone on HN can sneer at it all they want as stupid and not making sense etc. That doesn't change the fact that lots of people are working for nominally low pay via various online services. At best, it will just discourage me and others like me from bothering to answer questions here about it.