Most often means a more or less equal exchange or substitution of goods or services. English speakers often use the term to mean "a favor for a favor"....
I was having a conversation with a client, whom booked with me off of P411, and had ample "OK's". We got onto the discussion of "reviews" here on ECCIE, and he was very adamant about "I don't post reviews, PERIOD"....
Got me to thinking... I have been hounded for days by clients wanting me to "ok" them on P411... and I have logged on and done so. (In particular by the said client mentioned above!!) Full well knowing that if I asked him to do me the same favor by posting a review, I would be told NO. I have plenty of reviews, but what if I wanted to "freshen the stats" so to say, with a new review? So, now I am feeling like the Quid pro quo is lacking a little.....
Does this happen often to others? Or even, the other way around? Do some providers hold out on giving "OK's"? Is it really a UTR thing? (like your wife won't find out about P411, but will see a review and know it's you) Or, is it just lazy?