The fact is, stocks that go up are the ones it is wisest to hold on to. When absolutely everything is positive for the company, I'm surprised by people acting desperate to sell, and complaining about the hold on shares and time it takes to do a stock split. The stock split is one of the reasons for the success of the stock.
You can ascribe solely psychological reasons to the rise, but that's not the case. A stock split allows for greater liquidity and trading as there are more shares available, and more people feel confident about the company. It also makes it easier for institutions to buy, as they don't want to own so many shares they have a huge percentage of the company.
Everything about this stock indicates to hold, and buy. In fact, the high price of the shares may have been holding it back.
I'm also surprised people would talk so much and so desperately about selling. It's talking down the value of your own investment and makes selling at a good price less likely, so why would one do that and announce repeatedly you want to sell your stock?
News 
Market Data 
Discover 
