Also, I think that all languages are supper weird, and because of that they have their own unique cultural value that can't be measured. But in terms of economical value:
1. English happens to have the most speakers if you sum L1 and L2 speakers (1.132 billion)
2. English has by far the biggest non native speaker representation (753.3 million)
3. Speaking English gives a lot of economical opportunities, because English is widely spoken among the richest people in the world. By rich people I mean top 1% with more than 30 000$ income per year i.e. people living in USA, Western Europe, Australia etc.
Because of these 3 points I do consider all other languages, including my native Polish, inferior as a tools. And I say this even tough I'm fully aware that millions were dying across world and history in defense of their native speech. History of my own nation and my native language is a perfect example. Millions of Poles died in defense of Polish language against Germans and Russians.
"We won't forsake the land we came from, We won't let our speech be buried. We are the Polish nation, the Polish people, From the royal line of Piast. We won't let the enemy oppress us. (...) The German won't spit in our face, Nor Germanise our children, Our host will arise in arms, Spirit will lead the way. We will go when the golden horn sounds. (...)"
But I think it is exactly the fact that we were not able to communicate with each other that lead to the World Wars in the first place.
I'm studding now in English in a super diverse Dutch university with Germans, Russians, Chinese, Koreans, Arabs, Belgians, French and many other nations, and thought that some 100 years ago we would be all trying to kill each other while living in trenches is just unimaginable. English facilitates that and I would want more people across the world to participate. Being defensive and overly proud of our native language will not help with that.