I buy branded products, but that has nothing to do with positive advertising effects in the sense they are being discussed here.
I bought my last car because I know someone with the same model and I liked it. If I were in the market for a new laptop (or whatever) I might well be guided by fellow commentards. Adverts? No. If I buy a branded product after the company has inflicted advertising on me then the purchase is despite of their annoying behaviour, not because of it.