it's always so hard to tell without seeing it in person.
it would probably help if you took some better pics. drivers and passengers floor. both side lower doglegs, both side rockers, underside, outriggers, bottom of the nose, rear corners. all the places that buses are known to have rot.
what is the history that matt speaks of? accidents? liens? aircare?
3200 us or 4000 canadian is a tad high, but thesamba worthy. i rarely see a bus under 3g us that seems to be in the condition of yours, so you seem to be on par.
have you had any calls? any interest at all?
if you really need to get rid of it you may have to take a hit and lower the price.