An Evinrude is only worth something to their current owner, because they know the engine and are comfortable with it. Lots are super reliable workhorses like the older Gen1 V4/V6 (specifically the V6 - 150hp model) where Bombardier figured out all the problems in the early 2000s and then kept pumping them out for over 10 years.
I bought my boat with a 2019 Etec (G1 V6 135HO) about 2 years ago, and likely overpaid because I didn't negotiate down hard based on the motor (and I really wanted that particular hull). Mentally, I budgeted a full repower in a few years - but honestly its been great - tons of power, fuel efficient, one minor issue easily resolved at Lordship (hell, its actually still under an extended warranty - which Evinrude still honors). The cost/ease of XD-100 easily beats annual oil changes (based on the relatively low hours I put on every year). Parts availability is totally fine. Haruna and Lordship still work on them and supply parts - and if you like to do it all yourself Crowley is like the Rock Auto of boat parts - complete with exploded diagrams for every model.
So where does that leave me? I'll keep the motor and run it till it dies / becomes unreliable, and then re-power - that could be in 1 year or 15 years. If I need to sell the boat, I know I won't get much for the motor - I'm fine with that. I realize its not worth anything to the market, but it provides value to me with 135 horses of reliable/low cost forward propulsion.