Advertising on popular channels such as Disney will likely cause ROBLOX a good amount of money.
Unless you/ROBLOX thinks they might rake in enough players to make up for the money lost, they probably won't do this.
Obviously it's a risk, But every company has to take risks sometimes.
Like what Google did in it's early days. If they didn't take risks, They wouldn't be as popular as they are today.
~ Conquerors101