Both YES and NO can be valid answers. Depends on your strategy and intended results.
NO. There are a ton of ways to do linking that brings significant weight. Dont waste your time on pingbacks.
Not a very good idea.
Nope, don't do it.
Just waste your time, only gather minimal result.
NO, it won't do any much good.
My answer will "NO"
Spend your time for backlinking do not waste it for pingbacks
I guess the keyword with the highest density withing your comments is "NO"have to agree...seems like a waste ..naah