Do "bigger girls" have the right to be frustrated at A&F/Hollister?

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So, as someone who's pants/skirt size ranges from between (US) size 10 - size 13, I sometimes find it distressing that I wear the BIGGEST size they offer at stores like Hollister and Abercrombie & Fitch. (Hollister's largest size is L/11, and A&F's largest size is L/12), and that if I were to gain twenty pounds, I would no longer fit in their jeans! (And their jeans are adorable, mind you, on the pricey side). Why do you think stores like these two do this kind of thing? Do you think that companies have certain intentions when "drawing the line" as to how big their sizes range from? Do you think this is an attempt to keep stores like Hollister/A&F exclusively for skinnier people? What are your thoughts? Do you have any similar frustrations for any other store? And if stores like Hollister, Abercrombie & Fitch, and many more WOULD offer bigger sizes ("plus sizes", if you want to call them that"), where would (or should) they "draw the line"? And for that matter, do you think that these "regular" stores SHOULD even carry sizes considered to be larger than average? Or should plus-sized clothing be limited to specialty plus-size stores, like Lane Bryant? Please share with me any frustrations & similar experiences you have! :]