@JohnnyC i believe the tech diver comment came from a conversation with me. I remember someone,
@tbone1004 i think, saying that the average lifespan of a tech diving career is 3 years or so.
I also personally know several individuals who did their full trimix course and have never done a deco dive since. I believe, especially at the Tec40-50 levels, that there are a LOT of divers who just did it to get the t-shirt.
@kensuf was also talking about how many divers do a cave course just for the badge.
The number of people that do an OW course just to post an underwater selfie on FB is, to me, quite staggering. Not that I want to yuck their yum, but someone who is diving purely to feel good about themselves is much less likely to take active care of the environment they are in.
IMHO, YMMV etc