*Edit* didn't notice it was the Carb section, posted my reply as if it was "general" talk.
You donate, not subscribe.
The donations done are specifically for the job already done, not what is to happen in the future, tough many authors keep updating their mods and maybe a donation just increases their involvement with their addon a while longer. Patches may not be instantly the first day or week of patch, but they get their heads around eventually, at least the most popular addons.
Let them get some time and they will, don't worry, even if the author no longer works on their project they usually get replaced or co-authored by someone that loves it and knows how to code, so chances are it won't just die off.
