Badges are kind of useless if any random person issues it, but they are kinda cool if a client is the issuer. 

As client dev, you could issue badges for completing onboarding, for exploring various nostr concepts at your own pace, for referring other users to the network (basic affiliate linking), for achieving certain objectives like zap count, zap number, total interactions, number of comments, number of times you’ve been thanked by someone (would need some sort of a reporting system that just works on honor). 

These are just some ideas, but badges could be good tools to incentivize all sorts of things. Of course, some incentives might not be great or could have adverse effects, but they are worth playing around with.

Certain badge achievements could even translate into real world benefits (yes, like fking NFTs.. bite me).

Hire an illustrator, (or create a badge of achievement for helping your client create these - have some very high standards…) 

You could also issue one of a kind badge for certain helpful things like helping with translations, for developers, for designers .. go wild.

The point is, these come from reputable source - the client in question. 

Just saying…