You see, no investment is 100% guaranteed be it a trader or a hodler as all are very risky and due to some unforseen circumstances that may actually affect ones investments make some people to only be interested in trading rather than investing and you can't actually blame them at all. If not that Bitcoin has a higher level of volatility do you think it would have gotten this far? Inasmuch as investment in concerned, every investor is actually interested in a coin that it's future is certain that's why a lot of the investors are involved in Bitcoin. Moreover, you need to understand that despite the popularity of Bitcoin, it's still very much young looking at when it was invented till now so it's gonna take few more years before it's authenticity can be visible for all to see though it takes patience for an investor to make profitable and long lasting investments.
Let the truth be told most people are just interested in short term profits because they're always afraid of the fluctuations in the price of Bitcoin in the market hence they always panic whenever they buy at a dip and instead of the price rising it still dips further but they fail to understand that every dip gives and opportunity to accumulate more and hold for long term profits.
It's obvious you are emphasizing too much on waiting for a dip before starting to accumulate but I put it to you that if you have that mindset of always waiting for a dip then you might keep waiting and may end up not accumulating again because you will feel that the price has gotten to a level where you can't afford it and you will still be feeling that you might buy and afterwards it starts dipping so in a nutshell, there is no perfect time to wait for a dip before starting to acquire bitcoins and people who actually expect a dip before they can start buying are the short term investors that all they want is to buy at a dip price and immediately the price increases they sell off their coin. These set of investors are more or less impatient and interested in short term profits rather than making long term investments that would be more profitable and risk free and gives more comfortability to ones assets.