Ebay is an American and now global phoenomenon that incorporates selling of items at available and sometimes unbelievable prices. Its sheer nature of selling strange items means its fanbase of 135 million.
2 Additional Answers
There are millions of people that use eBay everyday. At the current time, there are about 212 millions uses of eBay which are a total of both the buyers and the sellers.
There is really no way to accurately determine how many people use ebay. People create and delete accounts every day as well as having duplicate accounts.