If you can get 5% in the stock market and the boat loan 5%, it's wash.
If we consider the boat loan a constant of 5%, anything close to 5% in the market make the makes the remaining amount pretty cheap money. Plus if your boat qualifies and it doesn't take much to qualify, you can declare the boat a 2nd home and write off the loan interest. All this without disturbing your money making assets.
In the market, I am doing well. Alas, I have been heavily in the market for over 30 years and selling any assets, capital gain at 25%. Of course IF I wait till I die, my estate will have to pay about 50% on everything beyond $500K, I think.
Those who get the remains of my estate will no doubt spend it on wild women and booze or maybe booze and wild women. I just hope they dont buy a boat. [emoji38]