I realize the thread started out as a dumping ground for ideas other people could pick up and build on. Unfortunately it's mostly impossible to adequately judge the value of an idea without talking to potential clients.
My advice to someone who wants to start a business would be to forget about thinking of the perfect business idea. I'd suggest: find one person who will pay you real money to solve a problem they have. That means talking to an individual, understanding their problem, solving the problem in a (preferably) cheap way and getting payed.
Then find another person. Solve problem and get payed. Then another person.
If you're lucky one of two things will eventually happen:
1. you will find one client that pays you enough (or often enough): a whale.
2. you will find enough clients with the same common problems that you can solve: a market.
From there on it's the more common business challenges like cash flow, capabilities, capacity, scaling, marketing etc.
The initial stages of starting a business should be looking for people who are willing to pay you ASAP. It's important to be passionate about their problem, but if they don't want to pay you then the problem isn't a big enough pain for them or they don't think you can solve it in a good way.
So forget about business ideas. Get emails, phone numbers and referrals that lead to face to face meetings.
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