@yoseft That's not entirely true, but I see what you are saying.
Even though you aren't putting special emphasis on a certain brand, it might turn out that you
are.
I personally know everything there is to know about Timex, the cheap watch brand. I have been buying Timex for years & know allot about them. For this reason, I might spend a few minutes a day answering questions about Timex such as 'Saw this guy wearing a cool watch on the subway into work. Anybody know brand & model?'
By answering these questions I am technically promoting the brand & possibly prevent a potential sale from falling through due to lack of information.
As a brand, I would have no problem rewarding (small rewards) the people who are promoting my brand indirectly.