It's a bit difficult to tell what the experience will be before you jump in, and it's not very fun when you do. Screenshots of the experience would help a lot.

Also: After seeing it, it's not going to work very well for HMF-level people since most people don't know what an HMF looks like.

It might be better to randomly swap extracted features them around with other people so that you can tell how you're measuring each feature. You might find some features deserve drastically higher weights to correct for people's subjective "feelings" about how much someone should make.

I like that it tells me how other people guess (after I submit my own guess), but it only tells me the mean (and it says average). When it had collected guesses for my salary, I watched for a few guesses to pile in and it seems to be taking the mean of them. I don't think this is a good idea, for example someone guessing very low repeatedly will drag down everyone's score.

It might be useful to collect "what do I think this person makes" separately from "what do I think this person could be making".