[crazy pyro]

Have a list of things showing what you would define as increasingly advanced computer knowledge or what you use it for, so 1 could be that you can browse the internet confidently, if you couldn't you couldn't find TPU so you wouldn't be getting any Zeros.
With 10 being you understand how binary, and all the various parts of a computer work. I'd personally put myself at a 3 or on the scale as I can solve the majority of software related problems in windows (at least ones that average computer users come across) but when it comes to hardware I'm clueless, I wouldn't even attempt to OC anything because I'd be afraid of breaking it. Unless you're confident with hardware you shouldn't be able to have a score of either 5 or 6, perhaps to establish this you should ask a question on whether or not you've built your own PC before.
Something that would give at least a very basic understanding of this would be adding to the system specs an option for custom built or the manufacturer or your computer.
The system of making other users rate them sounds quite good, however you can't tell what someone's knowledge extends to just from one post.