Real estate agents just want some inventory to sell....we've gotten cold calls too. Because so little is on the market right now, they don't get their commissions.
As for the more ambitious developers, they just want the land. They can buy a little ranch for 500-600k in a nice town, level it, and rebuild a McMansion for 200k and then resell the thing at 1.1 million easily after being all-in at 700-800k.