Sadly, all of this stuff is a commodity. The market is flooded with such "experts." I'm not saying you aren't better than all of them, you may very well be, it is just very hard to differentiate.
I think you're right that it would be hard to differentiate.
I don't think there are many actual experts though, experts as in the people your developers call when they can't figure it out themselves. But the marked is probably small-ish, and there's a large effort to become a real expert.
