I think many collectors feel they are curators of the beads they collect, and try to preserve them as-found. However, most of us are not finding old beads in the location where they were originally made or traded - they have passed through many hands and locations. So true curating becomes a problem due to lack of accurate provenance.

Many beads are altered (for example the Bakelite beads I've been collecting) before we acquire them. Re-drilling, carving, repairs, cleaning, etc are all found. So, making further alterations is just adding to the history of the bead, IMHO. Unless part of an archaeological dig site, I feel that all beads are meant to be worn and enjoyed, in whatever way the owner likes.

Just some thoughts for a sunny Thursday morning!