I'm not the one selling something. Maybe you need marketing, but I don't. On the other hand, if I'm actively trying to buy something, then I'll appreciate you

I'm not the one selling something. Maybe you need marketing, but I don't. On the other hand, if I'm actively trying to buy something, then I'll appreciate you telling me what you're selling. If I'm in a bike shop, it's because I want to buy a bike. The shop doesn't need to know where I was earlier. If you as a seller want to know more about your (potential) customers, maybe… ask them?