Matt,
This is way beyond anything I really know anything about, but that's never stopped me from voicing a thought, so here goes:
It appears the benefits (and profits) from selling used boats is better than the dollars realized from selling new products. If that's the case why would any dealer sell New? Flooring costs and hassles, warranty claims, dealing with marginal manufacturers - gee's why would Anyone want those bothers?
Wouldn't it just be easier (and more profitable), to be a first rate used boat dealer? Take-in only the good products, go over them mechanically, get good guy's on the buffing machine, and put the product out the door! Most would be consignments anyway, so pre-sale investments (detailing, repairs, etc) would be repaid at closing (even using a mechanics lien for protection if necessary). ...and no down-the-road repair issues (unless the buyer wanted to spend extra for a separate extended warranty).
Your ideas?
Best,
Casey