Man, some of you just want to argue for the sake of arguing!
Doc Cheese is right on! Apparently, some of just don't have enough experience to appreciate what he means when he says, just for example, "nice action". What you consider to be "nice action" is action that other people, like maybe Cheese, would play and say "that's okay, but I would prefer it much lower". I thought I knew what "nice action" was until a buddy (who is a much better player than I am) let me try out a really nice bass of his. IT actually had really nice action. And made my MIA G&L and EBMM basses suddenly seem kind of shabby in comparison. Not to worry, I took mine to a really good tech and got them Plek'ed (or re-Plek'ed, as the case may be) and setup so they ended up just as good as my friend's, but I digress.
The point I got from Doc's OP was one I totally agree with. An expensive bass can (or at least should be able to) be setup with much lower action than what a newbie can take advantage of. That ability to take a low setup is part of what you're getting for your money. And no newb is going to be able to play it with a setup that is that low. I'm not a newb, but I'm definitely not a very good bassist and I've had several higher end basses that arrived with action so low that I could only play them if I played very slowly and totally focused on my technique. I.e. I couldn't play them for any real work. But, I am knowledgeable enough to tell that somebody with much better technique than I have would be able to play them just fine.
The factors that go into a bass being able to take a TRULY nice action include good wood, good finishing, excellent fretwork, and an expert setup. Which are exactly the things you should get with a more expensive bass. A newb may get SOME of the benefit of a more expensive bass just by virtue of looking nicer in his or her hands, hanging on a wall, etc.. But, they are just not going to get the full benefit of that extra money because they don't have the skill/technique to take advantage of what the higher end bass CAN offer.
When you can buy an SX for $100-something that will take a "decent" setup, Doc's point (which I agree with) is that there is no advantage to a beginner in spending much more than that. It's not going to help them play better or learn faster. Nobody is saying people should learn on stupid high action. We're just saying super low action would be even more frustrating (at least, it is for me, to have buzzing on every note because my technique is too ham-fisted), so there is no practical reason to spend a lot more money on a bass that CAN take a super low setup.