I don't think it all about how many coins you are holding, I think its about how worthy are the coins you are holding. There have been scenarios when people held about 15-30 or even more coins and they ended up as shit coins. Most people hold coins but they don't Know if those coins will worth much in the future. So its better to hold 5 or more coins which will give you bigger profit at the long run than hold 10 to 30 stone coins.