My partner lack's of interest in certain activities, such as pricing chain link fence hardware, continues to baffle me. But I'm a maximizer at heart, and the point of diminishing returns is usually posted on a road sign I blew past at 80 about two miles back.
He, on the other hand, would not research a project at all until... ever. Which is why there is still a partly disassembled washing machine in my basement which may, or may not be reparable. Bless him.