Well by clocking up over 140K miles and doing my own servicing for the last few years - I've convinced the missus that 90% of buyers probably won't be interetsed, and trade dealer will rip me right off. And for the 10% who appreciate a well looked after motor, I'll probably get back less money than I've actually spent on mods - let alone the car itself. None of these points matter though because I'm not selling it. She's okay with it now.
My missus also spent £3K getting here eyes 'frinkin' lasered recently, which has improved her life. I argued that since I was born with superior genes and do not require such procedures, I can spend £3K towards something which will in many ways improve my life... such as FI (yeah I know I'll need a bit more dosh...).
Unsurprisingly, here she disagrees with my logic. She'll come round...