Everyone is welcome to an opinion, but how many have you asked why they left? How many have PM'd, texted, or called you and discussed their departure, either before or after? Hell, some have explicitly posted that's why they've cut back on posting or left. I also know why I don't bother posting nearly as much information, etc. elsewhere any longer. I've nothing to sell and my nuts are sufficiently hugged, but I won't waste my time teaching those who don't wish to learn. For awhile, the minority who do want to learn is worth dealing with the others, but it eventually just seems like you're stuck in a loop. Pushing the boulder up the mountain for bringing fire to mankind and all that.
I guess if you'd like to remain cynical you can assume they are lying to themselves and others and it was really all about whatever you want it to be about, and I've obviously not talked to everyone that left, but what I'm saying is the cited reasons.