I'm not affiliated with Tim either, I just bought two of his products, I like them very much, and I think they're worth what I paid for them, especially considering how well they work for me. He also wants ideas to improve his products (from actual users) so he's not throwing something quickly together.
I already tried faucet washers, super glue, DAG covers, Leicagoodies stuff, Cameraquest patches, etc. I'm very happy with Tim's product. In fact, if I do pick up another M body, I will order another eyecup, right away!