If a card limited (ACA1232 50 MHz), and all sold under 1 month (2015. dec., was 300 Euro), never more available, and I modification a 33 MHz 1232 card (original price was 155 Euro) to 50 MHz, and 100% OK, then my card rare, and real price min. 300 Euro. Thats is the reality.
The modified card is more valuable at the original card. The modification increased the value of the card.
Why does nobody understand this?
If I modified a Blizzard 1240 68040 25 MHz (400 Euro) card to 68060 50-80 MHz (Blizzard 1260, 600 Euro), then I increased the value (min. 200 Euro) of the card. Many people did this already.
They sold (amibay, 600-700 Euro, 66, 75, 80 MHz) many cards already. Nobody complained that the card is modified. Everybody was glad that somebody modified the card.