Alot has changed since Bitcoin was created till date. I can say, the confidence level now towards Bitcoin has grown greatly that anyone can now invest in Bitcoin with the little money they have available either  through DCA or a lump sum investment.

Investing with your discretionary income might not be enough if the investor does not understand how investing in Bitcoin works. I will rather tell newbies to try to do research to know the risks involved and how profitable investing in bitcoin can be. The result they would get from their findings will help them decide how much of their income they want to invest.

No one loves to lose money.  Don't tell me to invest what I can afford to lose; tell me things I should do to avoid losing that money or even minimise the risks of losing that money.