I have personally turned down an offer very much like this. I could have paid my (at the time) salary and benefits with about 2 days work a week with the option

I have personally turned down an offer very much like this. I could have paid my (at the time) salary and benefits with about 2 days work a week with the option to bill as much time over that as I wanted as long as I agreed to work at least 2 days a week on thier top issues. The ERP system was a nightmare, though, and the company was difficult to work with (key, long term employees). It was a system I inherited, built out of garbage, that I tried to improve. Before I left, I found a very experienced contractor to take over, on-boarded him, and stayed as a support resource for a couple months. Six months later, he's retired and I'm getting panicked phone calls. I valued (and still do) my current job far more, even though I would probably have done better financially in the short term with the alternative. A few years ago, I heard they migrated to a new ERP at long last.