I don't know if there is a market for custom bushings.
I do think that there would be a market for a small business that stocks/orders polymer and DU bushings for bike suspension, along the same likes a suspensionforkparts.net, especially if you had a database of what bushings were needed for various bikes.
For instance, I have often seen a pair of Klein Mantra main pivot bushings listed for $50 on ebay. I was able to get some as a sample from IGUS, as small orders of 2 bushings to a new account isn't really of interest to to them. The bushings listed for $6-8 each IIRC, so long way from $25 each...
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