I’m not in that market, but a quick search shows a Tohatsu 9.9 new goes for about $1,100. Tohatsu makes the lower HP motors for the major manufacturers, and even a new mercury can be had for $1,300 depending on model. To put it another way, would you be willing to buy a new Mercury for $1,300 and loan it out to someone for 13 years if they paid you $250-$450? That’s less than $40/year in depreciation.