Real-revenue cases
A US engineer built a foldable insulating cover for pull-down attic ladders after spotting the air leak in his own house, then sold it direct-to-consumer and through resellers and contractors via his own store plus dozens of marketplaces; founder reports $135K/month.
01
It replaces the unsealed plywood sheet over a pull-down attic ladder; the air leak is a persistent physical problem and 2009 building codes made sealing and insulating the attic access mandatory. He validated fit by installing kits in his own and neighbors' homes first.
Homeowners buy single kits on the company site and marketplaces like Amazon, eBay, HomeDepot.com and Walmart.com; distributors and contractors buy in bulk to resell. Revenue comes from unit sales across many channels plus wholesale accounts.
The thin unsealed plywood sheet over a pull-down attic ladder, and bulky DIY covers homeowners built from plywood and insulation board.
02
Not stated explicitly; the page only says the first sale came the day the site went live, after submitting to search engines, link exchanges and blogging.
03
Not an AI business itself, but the 'influence the influencer' play transfers: for AI tools sold into gated industries (compliance, audit, procurement), winning over the people who set standards and write recommendation lists beats direct ad spend.
04
Revenue basis · Founder self-reported, unaudited (see source page)
The $135K/month figure is founder self-reported and unaudited, and the page shows both 2003 and 2013 as founding dates, so the timeline is unverified.
No gross margin, repeat-purchase rate or channel-level revenue split, so the real profitability of multi-marketplace selling is unknown.
No detail on which channel produced the first customers, and no conversion data from the cold-start phase.