I hope there are not any scammers who are pretending to buy/sell lisk and then rip off people.
You can be scammed on any currency exchange, if you are not cautious enough and avoid certain trade partners.
I wouldn't blame it on the coin you're trading, but rather on the person you're trading with.
For the lisk threads, alot of people accumulated those coins in the ICO either by buying or by participating,
it's only natural alot of them want to chash out and bring in their profit, now that the ICO has ended.