I would have to agree with most of the comments so far. In reality, it's up to the buyer to determine what the card is worth to them and how much they will pay for it. Me, personally, I don't care too much for trimmed cards, but if a card is usually high priced in any grade, but can be offered at a reasonable price altered, I will consider adding that to my collection because spending money on cards can be tough to get sometimes.
But I do agree that trimming does take away from the value of the card and the severity does matter in the trim job as far as price goes. I just purchased a trimmed card on here yesterday and it really looks great...it was a higher priced card and being trimmed allowed me to afford it
Great discussion by the way!
Mike