FIRST: This is not advocating that TOR continue to deny addons. This comes from seeing the MANY posts for addons and getting frustrated at the posters for how they ask for something.
#1: Keep in mind that the majority of players will never use addons. Even in WoW, more players just log on and play without a single addon than those that use them.
20mil downloads for DBM alone no matter how you cut thats a lot of people using DBM
10mil for healbot
9mil for omen
Im not even gonna bother linking the dps meter addons
All i had to do was google the addons my mates and i used while playing wow to get those number, also note that the figures just come curse.com.
People use addons plain simple whether it is a good or bad thing, that i do not know.