Is there any way to link a users reputation to the current annual SO survey (or future surveys)? The stats that would be interesting are:
Any Correlation between user reputation and things like Position (title), Pay, etc..
I hope not; at least not if it means giving out my account ID.
That means I would have to tell Stack Exchange (and by proxy their advertisers) a lot of personal information about myself. For a start it's invaluable marketing material; more worryingly it would probably be enough information to work out exactly who I am. I do not want that information to be available. With an anonymous survey there is a lot lower risk.
The only way I see this working if you allow users to input their reputation manually, rather than linking it to their Stack Exchange account. This enables people to inflate their reputation to what they would like it to be, making the results less accurate.
Also, don't forget that, reputation, to a large extent, is simply a measure of participation. It's highly likely that there are people who are capable of having a high reputation who don't simply because they can't be bothered. Equally likely is that there are people who currently have a "low" reputation who will, in the future, have a high one.
Though I believe in everything I wrote above, the survey actually included this question anyway, so it's status-completed, see question 31 in the results. This isn't broken down and compared much in the blog post but apparently you can get the dataset yourself should you wish to play around with it.