These companies have payed millions of dollars to buy patents. HTC didn't buy the IP therefore it has to pay a licensing fee.
I'm not a hater so the point of my question wasn't that Apple's claim is baseless (I honestly don't have the knowledge to take a position here since I haven't done any research). I agree that companies should be rewarded for their innovations but the patent system is so messy with the trolls and everything that I naturally take this kind of news with a grain of salt.
I like work; it fascinates me; I can sit and look at it for hours.