This used to be the case all the time though that said as the market grew so did the size of the patches. I dont know why the game industry so readily accepted the whole DLC Purchase thing, but i suspect people were cornered into it on the internet capable consoles where due to lack of a proper OS they were unable circumvent paying or something like that.
I cannot believe that DLC originated and was accepted on PC. I Still resent the phrase, and i hope it crashes and burns, and we can go back to patches and expansions. (Its a weak generalisation i know, but imo expansions cost 1/2 - 1/3 the cost of the original and add content up to equal to the original, and sequels add engine updates etc.)
What have you guys seen, for me MOST DLC offer crap value outside sale time, when compared to expansions?
While i generally only purchase 2nd hand when a game cannot be obtained otherwise, eg DS2, Some people (most people) cannot afford to buy every new game every release, thankful valve knows this.