"When I see a personal address in that field, I automatically think it is a faked address."
Why do you assume this? I assume that the domain name was registered by an ordinary person who isn't' terribly familiar with the customs involved.
I don't think the exposure of the email address is the significant issue here, though. The significant issue is the exposure of phone numbers and physical addresses. I can easily ignore all the spam that I'll get through an exposed email address, but the spam that comes through the phone and physical location is more problematic. Not to mention the real personal risk exposure of physical addresses can pose. The internet is full of crazies, after all.
That's why I have to pay extortion money to my registrar to keep that information private.