Yobit is a very bad bad exchange, they Ban people who prevent in chat other user they are buying LISK IOU token!
They have something to hide on this. If i'm in the LISK team, i never give any LISK to this exchange when it's realised.
They deserve to be punished
It's free market, they have rights to have moderated chatroom.
An investor is an investor.
The team cannot decide (or actually know!) who's right or wrong to invest.
That's the whole point in crypto, trustless and decentralized world.

Having said that, im quite sure Yobit will not risk their business and reputation for some 100's of btc.
After all, their exchange has some volume, and is profitable i assume.
If they'll stand behind their "word" and will change all the iou's in real lisks at launch,
Then they made a great business move.
Same was done with Eth and Bittrex (ethercoin), Augur and Gatecoin..
Demand is there, small exchanges want in before the big ones enter, and its reasonable.