NBA partners, what is their slogan its that ( Play 60) I can see it now ( Play 60...... ON A COMPUTER ALL DAY BABY ! )
On a real note most of the Sport Companies, Ads, Markets, and other big names Partners don't know what computer games have to do with anything that involves a "Sport" So the already well know sports Companies and other brands( Nike-Sprite-Footlocker- etc will also not form with the Esports scene if the NBA-NHL-NFL and other major sport scenes won't as the ADS will lose their milk and butter money from those already established companies.
Its only been 4-5 years professionally for the LOL E-Sports scene so just give it time. Alot of people this is just another faze, that will go away.
The ads and companies that I do see forming with the LOL scene somewhere down the future ( HOPEFULLY )
Maybe ( SOUR PATCH KIDS) ( NETFLIX) ( COCA-COLA)
Sour patch kids can show the league players before and after good-bad things i don't know.
Netflix can show the regions and the seasons of the leagues
Coca-Cola can show pictures of the players and their names, instead of showing randoms names.
Just my thoughts
Have a Good One !