Yes, selling a Makita chain morticer is no problem these days. You can sell it on ebay, on post in the tool section here that you have one for sale. They tend to sell quickly if priced fairly. Like I didn't have a problem buying mine for $1000 with a new chain. It was described as excellent condition that had been used for one or two projects. The new chain was probably worth $300 new. Plus the old chain may be resharpened I think. I wouldn't have paid any more (baseline for a new one with 1 chain is $1305 plus shipping). I wouldn't spend that much on a used one that wasn't cared for well, is rusty, or has been through many many projects. A well used one may get down in the $500-$600 range I'm thinking...I've seen one with a broken casting. If there were repaired, Probably price it in that lower range. It has to be properly welded though by a pro who knows how to do that.
