According to Hovanian (via Briefing.com hat tip Brian)
[Land sales have] "just really slowed to a complete trickle with very few buyers of any type out there"
So homebuilders are building spec homes to liquidate land:
"that's part of the reason why you do see many home builders resorting to selling spec homes because there's really a way of liquidating the land portfolio."
Can't sell it? Build on it. With too much inventory already on the market, I wonder how this will work out for the homebuilders ...