Believe me I know. I had to sell my last two Toyota’s, both which I’ve owned for 10+ years and put endless miles on and did all the maintenance. However, there came a time when these cars were worth less than $4,000 and were rotted underneath and started having body rust. It just would t make sense to keep dumping money into mechanical maintenance on something that’s rotting away. Plus it’s a safety issue. Had my brakes fail due to rotted brake lines several times, replaced several seized calipers due to salt damage, replaced sections of the exhaust several times because of salt damage and failure to pass emissions, and on my buddy’s 1992 Lexus SC300 we had all of the above problems PLUS his rear subframe was so rotted it broke in half while we were having fun doing donuts in the parking lot. If your rust underneath is as bad as mine was, you can’t fix anything under the car without breaking EVERYTHING you touch. I get emotional attachment so from the lessons I’ve learned, any cars I care about are all Fluid Filmed and winter stored and I use a cheaper daily driver for the winter which is also Fluid Filmed just in case.