It may make it easier for some people. But that is besides the point, you are storing information on EVERY user of your plugin. Not just those that need support. You are keeping some data for no point whatsoever, in the view that they 'might' some day ask for support.
In fact, the way you collect this information is illegal in most countries and violates most Data Protection laws. Collecting data (and personally identifiable information at that because you take the email address) without consent.
I could steal my friends DVD collection without asking and sit at home watching them. He doesn't watch them that often - he can just ask me for them back when he wants right? It makes it easier for him because he won't have to spend 10 minutes looking for that "Harry Potter Order of the Phoenix" DVD I want to borrow - I will already have them all on my shelf. In the same way, you steal everyone's information with the pretense that it makes it easier for them. Well here's an idea. Make it easier for them WITHOUT stealing everyone's information.
I have looked through this forum. It has been said before that you can easily provide a link that says, "If you want support - click here". What does this link do? It opens an email pre-filled in with the blog information you need.
Another option - you have a URL to a website with a support form that sends you an email. This support form gets pre filled with the data.
Or even better, do what you do now, but ASK FOR CONSENT. Have it say, click here to send us information about your blog that will help us provide support. If somebody needs support - they click it and give you the ID - job done.
I am not denying that your "feature" makes it easier for people to get support. I'm stating the fact that your methods are malicious and there are far better ways to do this that offer far better respect to people's information. People deserve better.