I'd love to pay you a self-hosted version. There is also a good chance I'd pay you for a hosted version, so long as I knew I had the opportunity to upgrade to a self-hosted version, at a reasonable price for an individual with multiple domains.

I'd not pay for a version that had adds, and personally would likely to pay to remove adds, but it's unclear if that'd apply to many people.

Yeah, self-hosted with ability to use generic IMAP/SMTP accounts would be awesome.

And multiple accounts at once.

But don't let these wishes distract you for now. :)