I use 5 bitcoin wallets. just don't want to put all of my eggs in one container.
it's too much. there will be no wallet hack into your account if you use a lot of security. useless to use a lot of wallets. but no authentication
Guys wallets are using in more numbers because People use to work in many kind bitcoin works like trading, lending, account selling and more. So want that to be anonymous way. This is the exact reason.