Simply that Apple is producing enough to fulfull demand. Doesn't really answer the question though.
Not really an opinion, so much as an inaccurate statement of fact.
Probably because Best Buy and the rest would prefer you buy it from their store and not someone else. (Probably willing to lose a little on each sale because of high attachment rates for warranties and accessories.)
Finally someone who actually understands. Just because the 5c is available at places does not mean it's not selling. Sure there were more 5c's produced than the 5s ...