Must be part of the Theme I have set. It is currently set to "Curve".
I delete mine because I don't want my location out there for all time.
Nope, I'm using Curve (and have been since the change) too. Some members get more privileges than others. I can't even fully delete my own posts...
For the record, I'd rather people left these posts intact and just wrote "SOLD" in the title. It's nice to see what is being traded on here. 
+1. I'm also not a fan of when people erase their asking prices after an item has sold. I like to feel out the market...