Are you ok with someone altering a card they intend to keep in their collection?
With this question I am not asking about autographs, that is for another question day, to play devil's advocate what about trimming a PC card so that it is centered and has four sharp corners? What about coloring in those chipped edges?
What if you have no intent of ever selling the card, or given away for that matter, but you do it for your own personal appreciation of a beautiful card?
I don't like the idea of trimming/coloring cards for the simple fact that even though I have no intent on selling or giving away the card that does not mean that it will not get out to the collecting world some day. If the card is unmarked as altered someone may put big money in to buying a card and sending it to be graded and expecting a Gem Mt 10 but get back a card with an "evidence of trimming" sticker.