You are absolutely right, any investor who wants a huge return must or should accumulate Bitcoin and hold for a long period of time unless they don't want a huge return and then, they can go ahead with the short term investment and whether short or long term there is going to be a return but there will be difference in the return. However, investing aggressively in Bitcoin can be disastrous at times that is if an investor doesn't have a good discretionary income but when an investor have a good discretionary income investing aggressively will be a nice move as that will help them increase their portfolio faster.
It is not reasonable to expect a quick return on investment from any business. But comparatively an investor if investing in Bitcoin can get higher returns than other investments but he must plan to hold Bitcoin for long term. Bitcoin does not guarantee a quick return on investment but those who believe in it and hold the investment can get big long-term returns. One thing that investors must consider when investing in Bitcoin one should not consider it is a get rich-quick scheme. There is no guarantee of multiply profit on investment. Those who make the mistake of investing in bitcoins to get rich quick will face losses. But those who know and understand Bitcoin at a slow pace and invest regularly will be able to get the return.