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Because I don't believe that for example a trader is not interested in investing in bitcoin. Because traders have certainly continued to observe the market for years (for those who have been around for a long time), so they definitely know more about the progress of the Bitcoin price every day.
If I can understand your statement, are you trying to say that traders are more at advantage to know the direction and movement of bitcoin price. Well I will say your assumption is not completely correct because I have seen a bitcoin investor that are not even a trader and he always achieved a scenario that play out in terms of bitcoin direction. So the study of bitcoin movement does not depend whether you are a trader or not as bitcoin price movement depends on so many factors.
People do claim that they understand bitcoin and therefore they can predict the price of bitcoin probably in short term or in long term however this claims are false. even the person who you claims always have his predictions to be correct is absolutely making a guess.
The price of bitcoin over the years have been studied and some folks who are called technical analyst even find it very difficult to know which way bitcoin will go even though we have events that do point out that bitcoin will be bullish or bearish yet the exact price are mere speculations which somehow for some people falls to be closer or close to what bitcoin price is at the moment yet anyone claiming to know the price of bitcoin with whatsoever tool they use to analyse is probably making a guess.
Exactly because bitcoin price depends on so many foreseen and unforeseen factors so for someone to say he or she know exactly where the bitcoin price will be is just a mere speculation. I think the best approach is to remain flexible in the market.