The idea behind advertising shouldn't be shoving adds in people's face against their will. Zapvertising is powerful because it allows a v4v exchange, but far more relevant because you can target people who are receptive to ads!
Who do I want to zapvertise to? People who WANT to see my ads. People who want to buy my products and services or consume my content. Individuals enthusiastic about participating in a Nostr economy. I don't want to waste my sats marketing to people who are resistant.
So yeah, spam zaps will be an issue, but that's one we can solve. And if folks want to turn off viewing zapvertising I 100% support that. If I client disables it by default, I will personally not use that client. Both because they remove the user's choice (centralizing) and because I want to see zapvertisments.
We're so early.