It is in a very narrow band of desirability
Most who have been after these will already have one and probably a better model
The cost in making this one better will still be prohibitive to many given the price and availability of the 'correct' groupset or at least something akin to correct - Mavic and Campagnolo off-road kit has just gone up and up. Good quality Sachs wasnt exactly widely available then let alone now.
And theres nothing wrong with a Zaskar, they both have their place in the MTB world.
*its not the best finished of examples either, not when compared to what has been on Retrobike