Please elaborate.
1:1 cars in most states become classic at 15-20 years and and are considered an antique that is eligible for historic tags at 25 years. Yet I am not able to show my 1993 "antique" car with historic tags at hardly any car show that is strictly limited to "classic" cars because a classic car is mostly considered 70's and older cars only. I fully understand that there is a huge difference in the legal definition and the common definition of words.
The cutoff range on rc cars for vintage vs modern is what it is, not because of age as much as ability. If B4's are ever allowed to enter in the vintage classes it will be the downfall of the vintage class racing. The B4 is still being raced competitively in a lot of club races today. Even more so in dirt oval racing. Before my local dirt oval track closed my son was finishing top 5 every week in the street stock class with a goldpan rc10. I had just finished his new car (a b4) but just needed to paint the body when the track let us know it was their last night of being open. While the B4 is an old model it is still a modern contender.
As for collectibility of the B4. IMO a sealed one my bring a few bucks but it will never command the price of an original.