And in the end, what value was created? "Liquidity in the BTC market"?
To create value, you need to give someone else money. If I wanted to build a better society, I'd make sure everyone had the best possible education. Paying for this would bankrupt me, maybe even bankrupt the entire country. But with every single person in the country walking around with a deep understanding of music, art, mathematics, engineering, and science... as a society, I'm sure we'd do great things. Value would be created in the very long term, but not for me, the potential investor.
Then on the other hand, we have things like automated trading. That boils down to asking a bunch of people "will you pay $5 for this $4 bitcoin?" Anyone that says "sure!" just gave you a dollar. Do that millions of times per second, and you remove as much value from the system as possible.