I have a single page site which ranks #1 for what it's about and the majority of it's related keywords, it receives aprox 5,000 visitors per day from search on roughly 10,000 search impressions. It's roughly 2800 words in length with several images and a map. It would not make any sense to add pages to this subject and Google seems to like it enough to rank it well.
Adsense, on the other hand, will not accept the domain. I get a "this site violates our quality guidelines warning in search console and it specificaly says there is not enough content which is a violation of ToS.
Mixed messages/results. Does anyone have a single page site they've got ranking well and have no adsense issues? I just wanted to place a single ad.