I wouldn't over index on it. Sure, people will try to game, but I certainly notice when someone zaps me -- and if it's a business I almost always check 'em out because I'm curious.

It's possible you could just try to zap some active nostr accounts everyday. Primal on desktop does a nice job of showing the PFP of zappers on a given note. Amethyst and damus not so much.

I love the concept of zap advertising. It feels like something has gotta work!