What would make a SaaS starter kit actually worth buying for you?

Launching Toolstack tomorrow — a collection of browser extensions and tested Next.js SaaS starters (invoicing, feature flags, webhooks, usage-based billing, one that ships a real browser extension).

Before launch day, curious what actually matters to people here when evaluating a starter kit: is it the architecture pattern itself, how well-documented the edge cases are, price point, or something else entirely?

Also happy to share specifics on any of the 11 architectures if useful — team-based billing vs per-user, CORS setup for browser extensions, HMAC webhook signing, whatever's relevant.