Depends upon the brand and color and how rare the kit is. For instance a Rogers Dyna-Sonic wooden snare it very valuable while the metal model is much less valuable. But personally, I don't any of it really appreciates in value. My son has my bothers 1969-70 Rogers drum kit shown here.
http://cgi.linkclub.or.jp/~a2a/ejames2.shtml
We paid about $600 for it in 1970 and I would expect to get about $1500 for it now. Well you do the math, if we had just put that $600 in the bank it would be worth more that the drum kit. Moral to the story, don't buy anything because you think it's going to appreciate in value.
John