There are no problems moving a good clean name brand MTB around this area as long as it is priced within reason and is in good shape,hybrids sell very well also as konAaron snake said it is how you market them. I live in the flattest part of the state of NJ so if I need to rehab a MTB I install street tires and sometimes a rack if I have one and maybe a used set of riser bars and list it as a good commuter in fact the only bikes I have that have been listed 5 times in the last 60 days on CL are a Schwinn Suburban 10 speed and my mens Liberty 3 speed road bike and at a $125 obo should have been gone. I guess it depends on the area.
Glenn