If you're into old cars to make money, walk away NOW.
They are a hobby, they provide enjoyment.
We all have to have a hobby (or we go mental).
I justify my spending, by saying (to myself), if my hobby was gambling/fishing/footy etc i'd be out "wasting" money on that.
I'd rather Saturday night in the garage than the pub.
And if you spend the money over a reasonable time frame you wont notice it.
It's about enjoying the process (the build), the chase (getting parts), the acheivements (finishing things) and then the drive.
I get the van out about 20 times a year. With just rego and insurance that's $100 every time I turn the ignition key.
But I enjoy it.