Video A: 2 monkeys
Video B: wrestling
Suppose Mary's true level is about 5 kyu, and Joe's true level is about 3 dan.
If Mary wants to play a pro, it's
her choice.
She knows ahead of time someone is pro, and it is
she who chooses to pay for the lesson.
If she wants to play someone around her own level, it's
her choice.
I have some accounts a lot weaker than my peak strength.
Say Joe has a 5-kyu account, for whatever reasons.
If Mary is paired up with Joe, she sees his 5-kyu account; she does not know his true level is 3 dan.
But Joe does: he knows on this day, his level is still 3 dan, and he can also see her 5-kyu rating.
He now has a choice: to disclose this information, or not.
He can ask her, "I'm really about 3 dan. This 5-kyu rating is not my true level. Would you still like to play me ?"
And let her choose.
If he does not tell her, he is
hiding this information and
mis-representing himself, to her.
He is not letting her choose. He is choosing for her. In Go, he's forcing himself on her.
If there were no ratings in this world -- like in an Open division --
then everyone knows their opponent's level is like a box of chocolates; and that's fine.
But we do have ratings. And there are people like Joe who repeatedly mis-represent themselves.
Bottom line - you meet a sandbagger, try to learn from him/her.
If you don't feel like learning, resign and move on, why waste time. What's the big deal?
This is like saying a physiologically normal person jumps into disability wrestling matches --
repeatedly, over and over again,
mis-representing himself as disabled and crushing his opponents --
and you tell the disabled wrestlers,
"Hey, just learn something from that guy, or move on. What's the big deal ? "
Yes, we could just watch people jump in line, watch people bully others,
keep our mouth shut, and "move on". What's the big deal ?
Others in this thread have said, what's wrong with sandbagging ?
It's not illegal. Morals, schmorals. A 3 dan hiding behind a 5-kyu rating and crushing his opponents, repeatedly.
Hey, it's just a game, Joe is having fun, what's wrong with that ?
If you don't understand Videos A and B,
if you really don't see the difference between Mary choosing to pay a pro,
versus her getting sandbagged by Joe, well, enjoy your life.
And, why would I want to learn from people like Joe.