In short: The most expensive startup ideas are not obviously bad; they are plausible enough to absorb two years before failing. The recurring warning signs are a buyer who does not feel the pain, a workflow too variable to automate, a free incumbent that is good enough, and a why-now that cannot be stated with a date and a number.
The eleven
- The person with the problem cannot authorise spending, and the person who can does not feel it.
- The incumbent is free, ugly, and good enough. Spreadsheets have beaten more startups than competitors have.
- The workflow varies so much between customers that every deal becomes a bespoke implementation.
- You cannot name what the customer stops using when they adopt you. Additive products get cut first in a budget review.
- The why-now cannot be written with a date and a number in it.
- Every customer conversation ends in a feature request for a different product.
- The market is enormous and undifferentiated, so you cannot describe your first ten customers specifically.
- The value only appears after a large data migration that nobody has budget or appetite for.
- Accuracy needs to be near-perfect for the product to be usable, and you have no path to measuring it.
- The buying cycle is longer than your runway, and no pilot shortens it.
- You are excited about the technology rather than the workflow. This one is the hardest to see from the inside.
A red flag is not a stop sign
Several of the best businesses in existence started with three of these. A long buying cycle in regulated healthcare is also a moat. A workflow that varies between customers is also a reason incumbents have not automated it.
The point is to notice them deliberately, price them into your plan, and be honest about which ones you are choosing to accept. The failure mode is not having a red flag; it is having one you never named.