I do agree with changing the current process for lowering leechers but increasing the post limit won't help much, instead a new process would help much better for example:
- Email addresses with premium domain instead of public email services to have different limits (lower limit compared to public email services) - Minimum requirements such as requiring newbies to perform following actions before being able to start posting: Avatar change, adding some personal info (examples would be Skype ID, Birthday Date etc.) - Some additional steps before full activation ?
Above elements are just examples, can be adapted/changed.