Agree. Games i truly adore playing which i can extend for a little money is awesome. As long as its a perpetual license.
In my case i purchased all the addons for the Xbox 360 Magic The Gathering games, because i love these games. Also the only games i have 100% achievements and all the stuff totally unlocked.
The downside is when you buy some dlc and its the dreaded 100kb file. Then you feel ripped off. It was already on the disc! They cut it out to milk it?
Yes and no. They invest time and money of course. But i must admit i feel kinda 'safer' to buy a 22MB expansion than a 1kb key.
What i absolutely don't like is stupid advantages (pay this and you get better weapons!) over people who have no intention of buying addons.
Also don't like stuff that only is there for the eye candy, like shiny sparkling stuff and/or additional backgrounds.