Exactly, go with your gut feeling and if you think it's going to rise up in value over the short period of time (if you want to marginal trade on bitcoin), awesome... but if you don't think so, don't buy it... it's as simple as that. As for me, I tend to make that decision every day for my self. I see what new innovations are being made that might help out bitcoin in the long run and I go for a bigger purchase to hold; no matter if it starts to dip in price. But for me thinking that a couple of coins might make it big time in the future, I purchase a mixture of them when I have extra funds. But for now, I just sit back relax.. and when I have time to post on the forum, make some extra funds to hold on to with the sig campaign.