IMO, people got used to them. It's also a tough pill to swallow if someone plays 10k for a table/light/delivery and then doesn't want to look the fool and complain that it doesn't play right. That happened for years with the Reds. Probably most of the complaints during the Red days came from players that didn't own one.
I, in fact, play my best pool on a Diamond 7'. Compared to a 9' GC. It's smaller so it's easier. I'd say most of my pool these days is on Diamond.
I've said before, I think the main reason some people have good experiences on Diamonds, and some have bad, is they are more susceptible to temp/humidiy changes.
I play at a room in the philly suburbs that is all Diamonds, and I like them there. I play at another room in Delaware, and the Diamonds there bounce like a pin ball. Both rooms are new (less than 5 years old) Blue label 7'.
I was also at the Hopkins event last year and played in it. 100 or so brand new from the factory Blue 7', that were total pin ball machines. 5 feet away was a brand new Gold Crown Coin that Savanah was running racks on in the Brunswick booth, that was playing perfect. The ball came off the rail with noticeable less speed than it came in with. On a Diamond, the ball comes off the rail at almost the speed it went in.