The problem people have with this, is that it's the site known as Curse asking for money to make updating easier. Even though Kaelten is now with Curse, people ignore this fact and focus on the company (It's not Ace (WAU), it's Curse (Curse Client)! Oh noes!! ;)).
Exactly they here "Curse" and "WAU closing" and immediately shut their ears against anything else we have to say.
Despite the fact that (correct me if I'm wrong)
Kaelten's been employed by Curse for months....
The new curse client is only in beta so we're interested in getting it improved (which takes time) .....
Curse has been providing bandwidth and server space unofficially for months ....
Well now there's a better way. Update less addons less often (once you take out localisation updates and minor library/code updates you aren't left with many addons that need updating regularly). Subscribe to their project page on the wowace or curse site and get an email when they update. You can then open up the email and go "hey cool they did an update to fix the threat problem they were having on galv" and go update (totally made up example , yes I know accurate threat data is now attainable).
IDK If they attend to have a way of sending out emails for release quality or omg-you-must-update-now-major-bug-fix addons yet. A way of viewing simply what's changed would be nice but a way for the authors to click a button to notify users on a major bug fix change would be even nicer :D
With "not checking the website" I did also not see any "Hey, could you help me out with some donations?" messages.
No offense intended here but I do believe Kaelten stated that even donations wouldn't of been enough . IMHO it would of lead to the same situation once the donations dried up ...it would only have put it off to a few months or so. I think interest in giving donations would dry up after a patch day once addons started getting stable.
Your idea for a monthly fee type service is pretty good ...isnt that what Kaelten is doing right now ?