How much money do you put into a car?

when i was younger i had 10 e bodies lined up all at one time in varius stages. Got tired of the car hobby sold them all. Got married built a custom bike and the wife wanted a a body dart. Bought her a dart from california. Then the bug hit again. Then we bought 4 a body cudas from one guy They were in rough shape. The wife wanted the 68 convert. Built her the cuda to what she wanted. We went against some peoples rules but we mini tubbed it and added some futures we liked. It has overdrive ,fuel injection, disc brakes a/c etc.
When I had all the e bodys tried to keep everything original, not no more.Just wanna have fun.
The dart I prostreeted, it has 76000 miles never had a panel repaired or replaced also have a scamp with 48000 original miles The car is still like new and original from arizona
Sorry for being long winded but it seems like when I go through a car it cost 30 to 35 thousand but then they show good top and bottom
Thanks for you time
Brian