I run a website with over 15 million pageviews a month. It's been making me good money for over 6 years now and I had no intentions to sell but I've recently had a serious offer of purchase that is 8x what I made last year.
It's a very tempting offer but taking it would essentially leave me without a job as my other projects make no significant money and I don't see that easily changing.
There are no signs that my sites growth will slow down in the near future but I can't predict what will happen a couple years from now... for all I know, it could start a major downturn and I'll no longer be able to make a living off it. That's why the temptation to sell is high because it would basically ensure my financial stability for the next 8 years.
On the other hand, the site could continue to thrive year after year and continually earn more and more money for the next decade and beyond. I just don't know what the future would hold.
But I also have no real idea what my site is actually worth right now. If I do sell, I want to know that I'm getting a fair price.
Is there a company you can hire to look over your sites history, traffic stats, earnings, evaluate your market, etc. and give you an estimation of your sites worth?