Hi Ron,
I'am no expert for such a genaral question, but I guess that type 4's are still pretty expensive to build for a bug and that europeans are not wealthier than americans. Type1's are cheaper to start with and cheaper if you are not planning to go any further than, say 1800 cc. This hasn't changed over the years, though type 4 parts are more expensive now then about 5-10 years ago over here, so that might have something to do with it as well.
Greetings,
Walter
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