"Odd" ODE back on ebay - $500 more than before

This combination C/D model ODE just showed up again on ebay.  

It sold last month for 1,000, but now it's back for $1,500.

Here's the previous BHO discussion about it - - -  http://www.banjohangout.org/topic/220580

Here's the current ad on ebay - - - > > >  1972 Baldwin ODE with New Case  

​I'm wondering why it's back up for sale so soon, and:
what makes it worth $500 dollars more than last month?

​Oh - - - - - > > > Here's the ad for it from last month.