You can't know that.
I can infer it from the fact that when an expansion is announced, only a handful of the 100s of people that comment on its announcement thread complain about “another DLC”.
I can also look around and see that a rather large number of people don’t mind buying many of the available DLC.
Also, as has been stated, the current system allows you to benefit, even if you never buy a single DLC, through the free patches. In the 90s and early naughts, the notion of getting a large upgrade to current systems in a patch was unheard of. The best you could hope for was some bug fixes and MAYBE some GUI improvements.
In those dark times, you had to buy expansions, in sequence, to get significant improvements to the game.
PDS’s model allows them to provide the above, and new content, and new mechanics without a player dropping a dime on anything more than the base game, financed by those of us who eventually buy the DLC, a fine compromise imho. Even better, you dont have to buy DLC in sequence, which give players a lot of power to pick and choose what content they want more of.
Most people understand this, and thus don’t complain about it too much, if at all, but there are a few who just really loved the “old model” of getting nothing if you pay nothing. I don’t see what was so good about it.
Caveat*: I think the business model makes sense. However, I question the pricing of some of the DLC, and usually wait for it to go on sale.
EDIT: Also, the complaints about cost don't make much sense to me either for a couple of the above stated reasons. Many of the people that whine about DLC, are happy to pay a subscription for their favorite MMO, which makes absolutely 0 sense.
They are also happy to blow $15 on a pizza/beer/movie etc. but come here to complain about PDS's DLC model. give me a break.
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