Most of the IPO purchasers would've shed their shares on Friday and yesterday(volume was crazy on both days) and now the regular joes are left holding the bag. In fact, some of the big sharks have sold off their shares on Friday and went short on the stock, so they're making bank on this.
I would classify Morgan Stanley as a whale, not a shark. Can't find the article right now, but I read yesterday about big client of one of the underwriters saying he went through with the purchase of the IPO but dumped shares early and went short. These are the smart guys.
I tried to come up with an appropriate rebuttal, but you're right - it wasn't the middle class that was taken advantage of here, it was truly the "dumb money" who decided to buy a stock with a 100:1 PE ratio. Point taken.