We had a guy come into our shop with the excact same bike and problem. Among others, the issues were:
-that cross-ride wheel seemed a little pinner for anyone jumping that bike.
-rebuilding that existing hub essentially would require to to order the exact same replacement rim from mavic (as the spokes have a proprietary head), which is expensive and would put you right back at the place you were; with too light for a wheel for your use.
-the price you paid for that replacement wheel actually seems reasonable to me.
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