I do it.
I keep meticulous logs.
Based on this, I believe I am making about $7-8 an hour after taxes. This isn't factoring in the .54/mile depreciation at all.
This is my first year doing it. I will know a little more about whether or not it is worth it for me after meeting with my accountant and doing my 2018 taxes.
But as of right now, do I think it worth it?
Well, before this, I was selling on eBay. And because I also kept meticulous logs then, I can tell you that I was making only about $2-3 an hour (including time driving around to lots of different thrift stores and garage sales, cleaning and repairing items, preparing them for sale, photographing them, listing them in great detail, etc.)
My day job schedule can be a little unpredictable - working some Saturdays, working some evenings, etc. I can't commit to a schedule that a regular retail employer would tolerate, because my hours change each week so I can't add a traditional part-time weekend and evening job, like working at Lowe's or Petco.
But I can drive whenever I want. That's the appeal.
The most frustrating thing, for me, is dead time. Logging on and waiting, waiting, waiting, to see if there's work. Or driving out to a particular area on one call, and then just sitting there and waiting to see if you can pick something else up in that area, instead of driving all the way back home again before you get another call.