"a diesel may cost 3X-4X the price but could easily last 3X-4X as long, disregarding the peripherals."
Very true but on rec boats I find I am yet to find a larger engine that was simply worn out.
KILLED ! Not stored properly, water backup in the exhaust , dozens of reasons for DEATH , but not wear.
A gas engine in a displacement boat will frequently go 4000 hours with all the low maint costs gas provides.
Paying 3x to 4x to perhaps get 10,000 hours is expensive insurance , esp at 200 hours of use a year.
Well put... and, so very true!
General myths (as well as wishes and hopes) in boating too often pervade power train accoutrements.
There are many reasons to justify using/having gasoline or diesel engines. As is often stated: "Boats are a big package of compromises". Best to study closely before making choices.