Oh yeah. You did not know that?
There is a HUGE market for people buying dota 2 accounts because they feel "they would be a higher mmr if their team did not hold them back from their true mmr."
People with pay $100+ for 5.5k+ accounts and stuff.
Also mmr boosting is a thing.
In fact I had considered becoming a booster to make some money on the side for playing dota. I especially considered becoming a boost after my performance with climbing from 4.7k to 5.4k in 15 days on my main smurf. (example: https://i.imgur.com/hSgSvUw.jpg)
But the pay is not as good for boosting as you would think it is, and I did not know and reputable boosting serv ices to work for at the time so I did not bother.