

You want to know what’s unethical? Planning and allowing someone close enough to receive an inheritance wait for you to die before you provide them housing. Hopefully I am off base here, but it sounds like they could set you up with this situation now.
It sounds pretty shitty for a landlord to charge enough to support the remainder of their life with the rental of only half of a house, and it sounds like that is the intended plan for you. Just don’t charge so much as to be taking advantage of those without the privilege of inheritance, and you may even be providing value to the renters, as other comments have suggested. Feel good about that.
In the last few years I’ve finished a dozen or so. In college I used about 1 pen per semester from start to finish in the same way. I tend to use nail clippers until they are dull, too.
I leave a chapstick (Burt’s bees) at my desk at home and another in the pants I go out with (which moves to new pants with my wallet as necessary). Hard to lose things when I have a system, I guess.