MLS
Like your post, especially the bit about using more than one line, log books are cheap, flying and the memories are not.
I have a log book which is completed in one pen and one hand. It is the copy log book I faithfully fill out when I need to send my real log book to the CAA.
However to me the real log book is the one which has a wide variety of signatures, different pens used and the odd smear of engine oil from your fingers when you preflighted.
When I comapre the two I know which one to me has the most life and is the one I would least like to lose.