Do you mind leaving your mail address? If those returns are stable and you want to sell (in the future, too), I would like to talk. Many others here probably too.
Not looking to sell right now though. This site is in a field I have more than an amateur interest in. I plan to stick around with it for a while :)
1. Great content + organic backlinks. It's slow and takes skill (especially in content ideation and creation) but the results will be enduring
2. Great content + cheap, paid backlinks. This one is much faster but requires a budget and there is a substantial risk that Google will simply shoot down your rankings
You can't compromise on content though