7 billion people on this planet, surely every idea has at least someone who would pay for it, right?
If one person would, surely ten would as well?
That doesn't necessarily mean that 1) you can reach them 2) you'll be able to make money relative to the effort.
Both are good points to consider.
Is there a market for every person?
7 billion people on this planet, surely every person has at least someone who would marry them, right?
But would a hundred? A hundred thousand?
Not every idea needs 100,000 customers. If you can get 1000 paying customers while keeping your operation lean (ie. just you) that's a good chunk of change.
Of course. I guess it goes back to the intent of your venture. Are you trying to create a side income? or something that you can throw your whole life into?
1000 paying customers is a lot more than a side income. It's a lot more than most people's actual income.