We live and learn. 

You're right, we give the benefit of doubt but there are preventative measures required at times.

Newbies tend to place a bid then forget about it a few days later.

So I think having that block in place is not all bad as the genuine buyers may contact you asking why they are blocked giving you the opportunity to add that buyer to your exemption list.

It will also be light beer o'clock soon so, CHEERS.