People would always find ways to earn in every situation. It is also because there are still people are willing to buy. Considering that you have the money and you really love the game, would you fall for such tempting eBay sale?
For me, it is just a fad that hit the market (just like candy crush game), another popular game would emerge in the next days. As for the developer, Dong Nguyen, he decided to withdraw his popular game inspite of its popularity and big opportunity for money, because it ruined his simple life. Well, for this person, it still proves that “peace of mind” and “simple life” are priceless.