Oh yes, out of the thousands of practical applications this could have... trying to sell us shit we dont want or need is the best way of using this.
I just wish they would figure out how useless "marketing" is. Typically it only persuades those who are naive and gullible enough to believe the marketing claim. Thing is... you dont need 10,000 ads and direct neural interface to dupe those people in the first place. Anyone with half a brain is going to make decisions based on logic, feedback, personal experience, trending, etc.
OT: You know with how much is put into market research, its pretty much a slap in the face. Theres already tons of surveys and more cost effective ways to get that kind of feedback. Its almost as if they think we are lying to them.
"Ok we want to know what you think after playing the dragon age 2 demo"
"Well, its ok, but its sort of repetitive dontcha think?"
"You say you want more enemies to grind on, Check"
"No!... And btw, what the hell is up with Isabella?"
"Ok, good, Inflate Isabellas tits 45%"
"Oh god...I am going to die here, arent I?"
"All signs point to yes"