Personally my feeling is payments are fine as long as you arent financing the purchase till the end of time!! 5 years max! I also will not purchase a new boat because of how much they depreciate (just like everything else that is new).
I owned a boat which was 15 years old and held off on buying a new one for a few years because I liked having my toy free and clear. After a few years though I wanted bigger and faster and sold that boat, put the money down on my "new boat"--1994 Powerquest 257 Legend with only 196 hours and a tandem manning trailer. I owe $13k and financed that on 5 years. To me, thats reasonable--my toy doesnt own me and I will probably pay it off in less than 3 years.