3. SpellBee .org This one is crazy. 2.7 MILLION monthly visitors according to SimilarWeb, with an average visit duration of nearly 7 minutes. The ad revenue for this one is likely $15,000-$30,000 per month. Quite possibly higher, as again, the older/wealthier demographic. I did some research to find other spelling bee sites, and only found a few. It’s definitely not an oversaturated niche (yet lol). One of the few other sites is SpellsBee .com, which gets 1.9 million visitors/mo. Obviously, there’s plenty of traffic to go around.