Thank the morons that support the "Pay to Play" PC gaming model.
Luckily everyone except WoW has pretty much failed......
$40 to buy the game
$10-15/mo
$20-30/yr for "expansions"
Stop this crap or it will carry over to the rest of PC gaming....
MMO's have been around long before DLC reared its ugly head which the current generation of consoles.
As for the topic at hand, most DLC is crap, and most cases over priced crap at that.
There has been very little worthwhile DLC to come out and come out at a fair price tag for what it offered.
If you want to point a figure, it really started with the current gen of consoles. I don't get it really, console gamers really open up their wallets to be raped now, and willingly. Games go up in price by $10, high price DLC, horrible "collector/limited" editions that jack the price up big time.
If you asked most console gamers if they would spend say $100+ on a single game they would say no. But a vast majority of them do from the stated above. To top it off move on to new games very quickly and there have been few games that seem to actually stay popular after the next big thing a few weeks down the road comes out.
These pricing trends are now starting/have started to bleed over in the PC side. The main games on the PC side that see DLC are console ports, not many true PC exclusives have come out yet that have much in the way of DLC. But it will only get worse for big titles.
As for the DAO DLC, the only two I had were the one for Shale since anyone who bought the game new got it and I purchased Wardens Keep day one as well. Both imo were good (Shale was probably my fav character to have in my group and was just really entertaining to me) and were worth it. Didn't touch any of the rest and actually sold my copy of the game and figured I would wait for a GoTY version which now will be coming out with all the DLC and expansion pack soon. I really liked DAO, but I gotta say from what I've seen of DAO2, I have no interest in it sadly.
Only other DLC I've bought and also felt was worth it was Zombie Island for Boarderlands (haven't played bought/played the other BL DLC). I've avoided purchasing any other DLC then what I stated here. As I go on forums and such to find out how people gauge new DLC and in the over whelming amount of time people regret it so I simply avoid it.
My new standard now though is, for games that I am interested in and they have annoucned they are going to be doing DLC for, I avoid. I wait for a GoTY type version a year later with everything included.