I checked your website and the verification info you ask for is not IMO extreme. However for me personally, I would probably not send it to you in an initial email, I'll explain.
You have chosen not to list your availability in the Calendar section on your site. No problem, that's your choice.
Let's say though that I only have a limited time window to be able to see you say Tuesday or Wednesday between Noon and 3 P.M.
To follow your protocol, I'd be sending you my Full RS2K info, which includes my Full Name, phone number and Town, not knowing if you are even available during the time frame that I have.
So you reply that sorry you're not available (this is a hypothetical example) but now you have All my real info.
As a Hobbyist, I personally don't like to send that private and potentially damaging info to a provider until I know that at least there is the possibility of securing an appointment.
So to me it's not that I won't or can't provide the information you request, I'd just like to know it won't be a futile effort.
Chiguy