It's a very brandable domain, it's 6 characters long, and the potential commericial uses are enormous. If this were a .com it would be valued in the mid to upper $xx,xxx range. The trouble assigning value to .biz names are current .biz sales figures. Most of the reported .biz sale names are "reseller" price figures. Therefore if you were to get an appraisal, it would be at the "reseller" price range. $750 is a little high. I would put it at about $500.00 (undeveloped). End user price undeveloped: 5 x $500=$2500 (based on the fact end user prices are ususally 5x's the reseller price)
To increase the value of this valuable .biz domain you should go with your gut instincts and develop the property. Development always attract well-healed investors.