The compression or leak down number only say what each cylinder is like. The cost of replacement or overhauled cylinders is not huge.
However, on a little used engine the big problems will come from internal corrosion and deterioration on things like camshaft, etc.
When I bought my Auster it had done only 3 hours in the last year. One cylinder had 36 while the others were 78. It had corrosion and leaking round valve seat. This was fixed and the total was about $1500.