There's a tradeoff involved. Limiting which members can access the Code Sharing forum might lead to members being a little more responsible in leaving feedback or noting that they used a code, but that's no guarantee, and it would reduce the audience for developers and tempt users into making useless posts to add to their post counts. Requiring a minimum length of membership would reduce that temptation, or let us avoid a minimum post count, but would further limit the audience. Overall, such a change would probably not be worth it.
In theory, software could be written to reveal codes only when you post in the thread, but a simpler solution for developers who are concerned about the code sharing process is to offer codes to people who contact them, instead of posting them publicly. We don't mind either way.