At first I did the same thing, that is to sell my tokens as soon as possible, once entered into my wallet, so there is marketnya, then I immediately sell it. But when I started following the bounty campaign, my mindset changed. To get token from bounty required work that was hard enough, unlike airdrops, which only made a little effort. Since then I have held my coins, until the price is close, or equal to the price of ICO. Thus I get a satisfactory value.