same as rtbiscuit...my car is a hobby....and every new one I get I say i'm goin to keep standard? Never happens.
Luckily have some pennies to spend now and again....but mortgage, kids, hols etc come first.
And you never get back what you spend....but doesn't stop us.
Point in view:
Bought a Evo8 for 8k. Did brakes, carbon, turbo, remaps, exhaust, springs, wheels etc etc......3k+. Sold it one year later for ??? Yep 8K.
Enjoy the car as is, when funds become available then spend. Try and resist debt....TRY!! although I'm probably the worst adviser on modding cars (see above)