first of all think about the numbers you are saying.
for example if you invest 1BTC and gain 2x return that is 1BTC profit which is in a short time and equal to $4000 (or is it $4300 today )
are you not satisfied with your lets say 3 day $4000 profit?!!
also i have to say if you think the alt is going higher, as you put it "10x or 20x" then you put "it" back in if the price started rising after your "pull out"
for example you invest 1BTC, pull out 2BTC but it keeps on rising, you put 2BTC or 1BTC back in and gain another 2x or5x or whatever.
I agree with point 2 that you can always get quick profit and willing to sell and be happy. But the feeling of content will not be there if coin rise higher once you have sold it. This leads to point 3 and you plan to buy back the coin but sudden dump or loss will eventually lead to loss of confidence and risk taking appetite. If there is constant rise then eventually you will still end up earning x2-x5 time which is still good but comes at a high risk.