According to chatgpt here is why I zap developers the most

Developers create tangible things;

When you zap a developer, you're often rewarding something concrete: a bug fix, a new feature, a relay, a wallet, a client, or infrastructure that you directly use. It feels like you're helping produce more of something valuable.

Opinions are abundant:

There are thousands of opinions on Nostr every day. Even if you agree with someone, it's harder to feel that a zap will change anything. Another opinion will appear five minutes later.

You use the software:

If someone builds a feature that saves you time or makes streaming easier, you experience that value directly. It's similar to tipping a musician after enjoying a performance.

Incentives matter:

A developer who gets zapped may be encouraged to spend another weekend fixing bugs or adding features. The connection between the zap and future work is easier to see.

Signal vs. noise:

Development usually requires hours or days of work, while an opinion can take seconds to write. You may subconsciously value the effort and skill behind the contribution.