While purchasing 0.01 Bitcoin (BTC) might cost only 520$ today (in this moment 55.224,10 USD for 1 BTC), current trends in global wealth distribution and the inevitable realization of Bitcoin's limited supply could result in 0.01 BTC being worth $1 million in the future:

Because  when removing the 1.9 million coins that haven't beeb touched for over a decade from Bitcoin's supply cap, there is a maximum limit of 19.2 million BTC available for the world's millionaires. This leaves 0.37 BTC per millionaire, including the yet-to-be-mined coins, assuming Bitcoin's supply will be evenly shared between said millionaires.

At begining the March , Bitcoin's total supply consists of 18.64 million BTC, leaving 2.37 million coins to be mined. In 10 years, the supply will reach 20.6 million, or 98% of the 21 million total coin supply.

buy bitcoins, buy your early retirement!!! this is my idea ,

  It is your money, not mine but I have already bought that amount of BTC and it will be my retirement money.   I hope to help someone with this post and that in a few years they will remember me.