Originally Posted by
FastJake
+1
This isn't just some SS MTB. It's a purpose built trials/dirt jumper. If you sell it as such, you should be able to get good money for it (as trials/DJ bikes are a lot less common than plain ol' MTBs) and buy something that you actually want with that money. I'm all for experiments, but I see no benefit putting gears on this bike.
There are already tons of MTBs out there with gears. There are a lot less that were build for SS.
+100 Jake nailed it. Geared MTBs are a dime a dozen. Sell this unique one for real $$, pocket part of it, and use the rest to buy a nice geared bike of your choice.