I do have 2 ,but only use one.When I got the NBN connection with Telstra,I HAD to get a telstra/bigpond address,but I simply have everything which goes to it(i.e.accounts!) ,transferred to my usual email address.I cannot see the point of having separate email addresses unless I have a business, in which case it would be very useful,but I stopped working 7 years back,so I no longer have this need!.
I have two - my main Yahoo one that I've had for years and a recent Gmail one that I opened due to being unable to access Yahoo and needing an email to get instructions how to get my other one back.
Now that one will become a business address that I hope to start up soon.
I have 4. Never use 2 of them. One is for all my mail and different web sites I belong to and the other is for daily news and recipes. I only visit this address when I remember I haven't been there for a while.