On average, about 4,000 people delegate 17K ADA to the regular Cardano pool. The average pledge, i.e. ADA coins owned by a pool operator, is roughly 400K. The numbers are only approximate as they come from a small sample of data. Come take a closer look at the pools in the Cardano ecosystem.
Read the article: https://cexplorer.io/article/insight-into-cardano-pools