Well it only means your gains will be larger if you time things correctly and get back in. I've sold near short term tops several times, the problem is that it's a lot tougher to know when to get back in than you might think. In many cases I never got back and the price went way higher, making my sell at that short term top the wrong move because I couldn't get back in.
RE: If Bitcoin's eventually going north of $500k, we probably shouldn't worry too much about dips