Let’s see it from Finance point of view.
If you put 100$ in PayPal today, you will not have 100$ tomorrow due to inflation in the dollar price caused by the economic growth.
If you put 100$ in bitcoin today, you will most probably have more than 100$ tomorrow.
Here we are thinking very short term, but if you think for a year or so. It will make a considerable difference.
So if you are smart investor, you should save every penny you can. That’s the motto of Warren Buffet and that’s my motto.
I think the topic in here is not necessarily for investments but you are right. In Paypal, your money will always be the same just like in the banks. What you have deposited will always be the same amount of money that you can withdraw in the future but in the future it probably can buy lesser things because of the constant decrease in the purchasing power of fiat money. In bitcoin, there is a possibility that you are going to make some extra money in a couple of days but it's not going to be that much (in your example). In your example, that means that bitcoin has doubled its price and with the current rate, I don't think that it's going to happen in just one day. It takes a lot more money to increase this price.
Paypal and Bitcoin have their differences, advantages and disadvantages. You are still going to be the final judge of what you want to use because it all depends on your needs as a consumer.
