Should we use reputation to unlock features?

With both InstantForum.NET & InstantKB.NET we provide a great deal of control over the features & behaviour of our products using what we call permission sets. Whilst permission sets work well and provide a very fine level of control over the features available the responsibility for assigning these permission sets still falls with an administrator within either InstantForum.NET or InstantKB.NET.

To provide further flexibility we are thinking of offering an option to link permission sets to specific member levels allowing users to unlock features within our products as there reputation increases and they progress to the next level.

Applying a new permission set based on reputation has a number of uses…

InstantForum.NET

You could disable PMs for users until they reach a specific member level. For example "Junior Member". This requires they have posted at least 10 posts. This would avoid the problem of spammers creating a genuine account within your forum and then PM'ing members with links etc.
You could limit access to certain profile fields until a user has enough reputation.
You could automatically allow users with a very high reputation to edit any posts / act like a moderator.

InstantKB.NET

You could automatically approve comments for members who have enough reputation. This will reduce the manual approval of comments if enabled.
You could allow users who have enough reputation to add or edit articles. You would create a workflow as an administrator and ensure the content goes through an approval process before being published.
You could customize which fields are visible alongside articles based on reputation. For exmaple those with a very hgih reputation ay be able to see the status of a particular item within InstantKB.NET whilst others only see basic meta data.

These are the most obvious ideas however there are lots of possibilities if we link member levels into our existing permission set system. To goal would be to reward uses for participating in your community or knowledgebase by unlocking features as reputation increases.

I would welcome any feedback. Do you feel this would make things to complex or do you like the idea :)