Let's take 2017 for example. I made more or less 700% profit on the bitcoins I bought in January and sold in December 2017. Now I am not financial expert, but I seldom see any investment opportunity where you get anything more than 30% profit within a year.
So, let's put this into perspective for the people who are constantly complaining about the price. If you were used to low interest rates or even if you were lucky enough to invest in something where you received 30% profit, ONE good year like 2017 will cover the interest and profit you would need for the next 20 years. <700% divided by the max 30%>
On top of this, you still get interest on the fiat money that you deposited into the Bank, after you sold those bitcoins.
Stop complaining and wait for your good year.
100% agree because I was lucky enough to get in bitcoin early last year when the price is below $1K and profited more than my other investment in just a year. Although last year was different, and no one thought that we can raise and go as high as $19K and if you investment early 2017, but December that time you should be enjoying a good returns. But I don't know when we are going to see another 'good year' because currently we are still down. If bitcoin can replicate what route it did take last year then this theory of yours will hold true.