I have a scraprack. I was talked into it at a CKC in Phoenix! Your concern is valid, it can be frustrating to spend a lot of money to organize your supplies. But it's also really easy to find embellishments when they are consistently sorted and stored (and if you don't try to skimp by doubling things up in pockets - which means you can't see what's underneath). I go back and forth on being frustrated with the scraprack and with loving it. The basic set is definately most useful if you don't have too many supplies. I have tons of supplies (my friends call my house "the free store") so I decided several years ago that I would only store what I had room for in the spinders and storage pages that I have - I won't buy more. I store some of my stickes, borders, rub-ons, and punched shapes, not paper, letters, ribbon, brads, templates, etc.
I think you can tell by this less than helpful review that I'm conflicted on the value of this organizing tool! I am too cheap to get rid of something that I have invested so much in, so I keep using it out of stubborness. But I've never told any of my friends that they just HAD to buy a system for themselves.
Good luck deciding!