I don't really see how you damage the drums by installing bevertails, you basicly make the things playable, and I believe that drums should be played on.. Still I prefer the look of the b/b's and I'd more than gladly make a profit on fanatic collectors..
How can you NOT see it? You're modifying the drum from original by DRILLING holes! Anytime you drill or elongate holes, or modify in any way, you devalue a drum in the eyes of a collector. Yes the drum wil be playable again if you modify it to have later beavertail lugs, but at the same time the value of it just went out the window. You may as well fit Pearl or Tama lugs to it. The value of them will be the same. Like I said before its your drums, do as you like to them, but keep in mind when it comes time to sell them, they will be worth far less with beavertails on them than if you spent the dough on the repro B&B lugs to keep them "correct". :2Cents: