Using nice numbers you've about 25 percent tread remaining. If all wore true you might fetch $225 for all.Watching. I have a set of 33x12.50r15 KM2s with 6/32" tread that I'm about to replace and having a hard time paying a shop to trash vs keeping to resell. Even a few bucks profit is better than paying the shop to trash them.
Based on my miles vs wear, they still have another 5-8k before they're dead (at 2/32") for on-road use.
Looks like your first and third tire are worn a little lower than the 2nd and 4th.