A few weeks ago I wrote about the 70% rule – the idea that “good enough” with AI is often plenty good enough.
Since then, I’ve been building something new: a web based, shareable flexible fee slider that estate agents can put in front of clients. You can try the Preston Baker version here: Fee Slider App.
On the surface, it’s just a neat little slider with some fee options. But building it has been a crash course in where GPT shines… and where it can’t quite keep up.
Where GPT is awesome
I’d throw GPT a request like:
“Add a bar for savings above the slider.” “Even out the spacing between the elements.”
…and seconds later, I’d have working code. That’s the thrill: stuff that used to take hours now takes minutes.
Where does GPT stumble
Here’s the honest truth: GPT doesn’t see what I see.
It would move one element correctly but delete another feature (the share button mysteriously vanished at one point). It would fix spacing but forget the colours. It was like working with an eager apprentice: quick to help, but you’ve got to keep checking their work.
And then there’s the long-chat problem. Once the conversation got too big, everything slowed down to a crawl. I was always terrified of starting a new chat because you lose so much context, but eventually GPT just became almost unusable. That was a real limit — not about design details, but about the way the tool itself handles ongoing projects.
The tech stack
For the tech-minded: here’s what sits under the hood.
Hosting: Netlify – fast, simple deploys. Domain: 123-reg, pointed into Netlify. Frontend: Pure HTML, CSS, and vanilla JS (kept lightweight on purpose). Config: JSON files for each agent’s brand colours, logo, and fee scales.
It’s not flashy, but that’s the point: simple enough to run quickly, flexible enough to brand for each agency.
Why the limits are the point
The more I’ve built with GPT, the more I see the pattern: it gives me speed and scaffolding, and I bring the detail, the checking, the judgment.
The line where GPT falls short is exactly the line where I need to lean in. And that’s where the magic happens — where my idea stops being a generic AI output and becomes something useful, specific, mine.
How the slider fits into the Mastery program
The fee slider is now part of the Pro level of my Flexible Fees Mastery program – alongside the playbooks, scripts, and strategies that make upfront fees work in practice.
You get your own branded version with client facing version as well.
If you’re an agent and want access to the full program (and the slider for your own brand), you can find all the details here: Flexible Fees Mastery.
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