Yeah, I think the biggest culprit of this is super expensive quests with very little reward. Hell, the current event is 15 AP for less than 100 LUX. Sure, Queen Bee Omega gives a ton of Lux, but you are not guaranteed to spawn her. And it will probably start costing you AP to kill her after level 6 or 7.
Not to mention, the Special Quests are CRAZY expensive to run. 50 AP for the Olympia Materials quest. 50. I'm at 123 AP. A full recharge is just over 6 hours. I can run that quest twice, wait 80 minutes, run it again, and then sit around for another 6 hours before I can play again. With stamina recharges being expensive as well, it just doesn't really help keep people playing regularly.
The primary reason I'm avoiding the weekly unlock is because I know I won't get much use out of it now.