Vintage drums are (in musical instrument terms) still a bit of a bargain, the argument for guitars fetching more could then be transferred to the prices that violins can fetch.
Vintage drums are still a relatively new market, the vintage guitar market started in the 1970's and has had time to mature into several smaller "cult" markets. The idea of anyone collecting Silvertone guitars thirty years ago would have been laughed at but their value creeps up year on year.
This is already happening with the drum market, people are re-assessing early Japanese drums and brands like Kent are starting to appreciate.
I think the highest value kits, much like guitars will always be from the perceived golden era of the instrument.
With acoustic guitars, those from the 30s and forties fetch big money, electrics tend to hit a high from the 50s and early 60's.
The golden era for drums is more difficult but anything from the swing and early be-bop era seems to fetch decent money, but, much like guitars a good playable and adaptable instrument has a strong following which is probably why Ludwig 400's hold their value even though they are one of the most common vintage drums.
If I had a warehouse and a pile of money I would probably stockpile Radio kings, they have all the important factors, big name association, romance and playability. I can't see them losing much in the way of value.