MSRP is merely a suggestion from factory. It's a dream. You buy at MSRP and the dream becomes a nightmare for buyer. NAP is simply a price that is advertised across the land.
This also is the starting point. MAP is minimum accepted price by dealer or in most markets it minimum advertised price. Most retailers, not BPS, will work with you to get a trade or outright sell. The bass boat market is bit unusual as it is toys being sold, Not a tangible necssecity but a luxury purchase. BPS will negotiate on your trade value and will offer gift cards, lifejackets etc etc
Dealers can qualify a buyer quickly. Buyers come to boat dealers prepared to buy a new toy. Not like a car lot where a guy may need a truck in order to work.
Watching the boat market closely and choosing certain times such as end of model year is best way to get a better price.
I think it's best to make an offer as opposed to asking for a reduction. Everything is negotiable. If the opportunity isn't available now, be prepared to wait.
Shop around. due diligence.
Just my opinion.