Euro Zone prices always seem to be higher than those for like items in the States or Canada.

I don't believe that non-stock modifications ever deliver any significant returns on the investment. Especially when the mod is a "personal taste" thing. Like chopping the top or any other radical modification to the original.

As an example, a 1932 Ford Roadster in mint original condition will almost always resell for more than the most modified example. Radical modifications immediately reduce the number of potential buyers. There will always be a market for an original, factory correct car. The more radical the mods the lesser the audience.

Another example-a 67 Cobra with all matching numbers is worth way more than one without that advantage-even if there is nothing else about the car that incorrect.

The only time that my theorem might be wrong is if the changes were done by a well known and well respected modifier. Say that 67 Cobra is not factory correct but the changes/improvements were made by Carroll Shelby or the paint was applied by Von Dutch etc. Of course those mods would have to be documented and be just as they originally appeared.

I'll go as far as to say that most modified cars do not return their owners total investment never mind any sort of profit.

Make money in stocks or doing something that you're better at than anyone else.