Some people use many Bitcoin wallet specially those people who wants to earn a lot of bitcoin every week for signature campaign plus many accounts here in bitcointalk. As for me i only use 1 Bitcoin wallet , 1 is enough for me to received and send bitcoins.
it is very possible. bitcoin wallet reproduce address can also bring opportunities to earn more money. we are free to use it. it is a choice.
Lol I think it has become common knowledge. You do not need to explain to many people about this. back to the topic there are many reasons why a person has a lot of addresses. yeah maybe for this reason as well? but someone who has a lot of wallets maybe they want a security?