Yea, if the DLC was something massive like a Warhead-style expansion, they yea. I'd pay $20 for it (digital copy) - Warhead was probably $30 as it was SP AND MP, and was a physical copy. TBH Crytek's pricing seems pretty legit (other than the new $59.99 for PC price.. wtf guys), however, as we all know, its EA, not Crytek, making the prices.

I would pay for a boxed expension, but not a DLC, for exemple we got the maps FROST for free, how uncool would it be to be kicked from a server if you dont have the map

As always for me it depends on the content and price. Ill happily pay for DLC as long as its worth what im paying.