I had a guy come by today to take a look at them. Realized the tread is lower than the 50% estimate. Probably closer to 25/30% left. Rears with a bit more tread than the fronts. I also realized I have a spare set of 15mm Macht Schnell spacers I won't need any more.
In light of this I'm willing to throw in the spacers and take $800. This is a killer deal if you've been looking for 220s...