I think it is normal. there are many technique in marketing. in my point of view, your case just the same as banner that company put in the street. Actually we can manipulate people's mind, I will explain this to make it clear. when we spread information about a product to random people then they maybe not interested at the first time but the information about that product is already on their brain, day by day they will sometime thinking about it, and some of them will buy the product. for example, when we go to work, we usually only thinking about what we will do today, but today we see a new banner on the street about a new movie, today we don't interested in it, we keep see the banner everyday and then we start to curious about it, then some of us will interested to watch the movie. when we tell people about bitcoin it is okay if they are not interested yet in it because maybe they will change their mind. Avatar and signature in this forum also have the same role.