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"You shouldn't buy it" is not an answer. If you sell bitcoin on the market you should be able to explain why this product is worth the price. Except if you bought it blindly, with no rational reason, and now you are selling it blindly. Then of course you are unable to provide a rational answer.
If "Why should I buy it?" is a valid question, then, "You shouldn't buy it" is also a valid answer. Whether you like it or don't like it is up to you. Keep in mind, though, that doing the same thing over and over and expecting different results is the definition of insanity.
Take all the people that are currently holding bitcoin and spend the electricity to mine it and assume that from now on no person enters the system by investing funds. What all those holders and miners can do with all the beautiful features of bitcoin, with their payment protocols, network, etc. Well, they can send each other numbers. That's all. And off of numbers non of them can live.
I already said that a few days ago. Why do you keep repeating the same arguments incessantly? This discussion seems to be going round and round.
People cannot live off of or otherwise utilize "a space in the ledger" or "numbers in a database". All they can do is keep the numbers to themselves indefinitely or give them to someone else.
Every group of people can create such a system for sending numbers. It's nothing more but a primitive email-like system.
There is no point in trivializing something you don't understand. You may easily come to wrong conclusions when you use your ignorance as an argument. Bitcoin bears absolutely no resemblance to an email system and there is no point in comparing them. Read the Bitcoin whitepaper if you are interested in understanding its technical aspect.