they are charging money for it so sure, not a charity, but I don't think it costs anything extra for AMD to leave the multiplier unlocked,AMD isn't a charity. Not to mention these are unlikely to go into a board that supports overclocking. There is no reason for such a cheap part to be unlocked.
the cheaper B350 boards are perfectly fine and priced well enough for this kind of CPU
OC would be another solid reason to take one of these over the Intel stuff, oh well.