Technical co-founder needed for a 'neglected' app having 100,000 users

- I have a web app which I put together over a weekend back in 2008.

- It currently has about 100000 (one hundred thousand) registered users. But...... read on.

- The app has one very important feature missing.

- The app is poorly developed and very poorly designed.

- Most users don't come back after using the service once or twice (or thrice) because of that missing feature.

- The app is free.

- I put a survey on the app asking "Would you pay $5 a month if we add that feature?". 35% users said Yes!. Even if 90% of them are lying, we still have a great passive revenue opportunity.

- I spend zero money on marketing. Traffic is organic.

- I spend zero time on the app. Domain renewal is automatic. Hosting renewal is automatic. I just don't touch it. It runs on its own.

- I have been neglecting this project for so long. Procrastination.

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What I am expecting from the technical partner:

- Build that feature (PHP, MySQL and some third party APIs). Building this feature can be little tricky. I am not sure.

- Integrate payment gateway.

- Just handle all the stuff.

- 50-50% split of revenue.

- So, in a nutshell, do all the work and get 50% split.

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If interested, please give me your email id, I'll contact you. I am not comfortable in sharing the url here. I hope I am not violating any rule.

You may use services like http://scr.im/ to mask your email id.