Anything worth doing is worth doing well.  Some things are not worth doing.  

There are many kinds of trades.  A free exchange based on mutual information is almost always pure win.  The more of these that occur, the more efficient and productive the economy.  Some trades are based on taking advantage of differential information, and are a positive boon systemically, although they are not win-win.  They are win-lose.  An evolutionary process weeds out the losers, but they are constantly churning, so this process will never completely end, and is unavoidable.  It is bound up with the necessary process of price discovery.  No problem there.  Performing deceptive tortious or outright criminal acts to induce losers in order to gain thereby is just evil, seeking to harm others in order to benefit thereby.  It is morally indiscernible from any other larceny or fraud, and harms the efficiency of the market, and harms the productivity of the economy.  It is a defection and a despoilment of the commons.  I would that some batman go from house to house giving neckties to sociopaths like these.  Not my job, however, and thankfully.  On this forum I rub shoulders with these parasites.