2. There's no need for new recruitment
That's probably my favorite. The main reason why financial pyramids survive is that they constantly recruit new customers. Without that - the pyramid falls.
But there's absolutely no need to recruit new people for Bitcoin to function, am I right? Without new users, there'll be just redistribution of what there is among the current users, txns will still be going and the miners will have work to do. So there's no required amount of users for Bitcoin to function like there is in the pyramid. I see no potential flaws here.
This will be absolutely one of the best answers I could personally say to others. Even without recruitment, I can earn by myself but presented that being not a selfish person, I can also give the opportunity for them to earn if they want to and all they have to do is learn about Cryptocurrencies and do simple task that is easy to follow. Showing personal results of what you have gained through Cryptocurrency is another thing because seeing things can change the mind of a lot of people.