Maybe they are skeptical on using that because they don't have enough knowledge and experience for dealing this strategy. But if they could try to experience maybe at least years or more of doing those methods presented maybe they could figure out that there's something good happening on their investment. Although there would be challenges will came but if their belief and understandings on the situation is strong then provably that their would be no skepticism attitude will occur to them. Strategies are presented for those people to use it and it will maybe give them a good result if they keep learning on it and joining on various discussions which can help them a lot for information gathering.
We see those wealthy guys succeed its because they are capable to do the risk and have good understandings towards each situation happened on their investment. They also have good risk management that's why we always feel amazing for seeing them earning good result on investments they made.
Everyone is entitled for what pattern or strategy they use but what's important is we are following certain good tracks and good advices from knowledgeable people and we should not show any interest for those people sharing misleading information which possibly can dismantle our investment plan towards strengthen up our accumulation plans for future.
Yes, an investor is being sceptical when there is no enough knowledge on what to do and how to do it while considering the risk management factors. If we are to look at the most simple investment, Bitcoin is actually among the most easiest one can deal on, would be a matter of getting the required knowledge on the strategies to be implemented and seconded by discipline during the accumulating process. An investor should be open to get/learn different information but doesn't mean to practicalize it into our investment untill that information is confirmed valid enough.