Yes, it would seem there are many Skecher copies in the shops now. The style, canvas/mesh uppers, memory foam inners and soles are the same. But they are much cheaper. Next time I drive to to the shops I might try some 'fakes' on for size!
Skechers cannot be expensive to mass produce when you look at the materials involved. I wondered why they were so expensive when I bought my first pair a few years ago. They seemed a bit like upgraded old style pumps (or plimsolls if you're south of me.) My friend recommended them. There are lots of fans out there, but I get the feeling they must be a very nice money-maker for producers.
I see now, by the latest TV ad, they are branching out and trying to appeal to the younger, sporty woman, rather than the middle aged or older woman looking for day long comfort.