Estimates of the number of Bitcoin "owners" are always many times larger than the number of funded Bitcoin addresses. That means most Bitcoin "users" keep their coins on exchanges, which explains why centralized exchanges are too big to advertise here (anymore). Instant exchanges are much smaller, and their customer base is limited to the people who use their own wallet. I expect the percentage of altcoin "owners" that uses their own wallet to be even smaller.
The big money is with centralized exchanges, miners and casinos. The first 2 of this list don't need to advertise here. That just leaves casinos and some small instant exchanges.