I've lost count how many times I've said it to my clients or friends looking to start businesses and folk on this forum, and yet haven't I just gone and done this exact same thing!
I was being a smart ass. I 'knew' my marketplace and I second-guessed them - and I'm totally wrong.
Note to self: PETER, YOU ARE NOT YOUR CUSTOMER!
Here's what I did.
My wife is a hypnotherapist and an ex-smoker. She combined her qualifications and experience and developed a quit smoking product.
(But don't worry, I'm not pushing the product here, no links to be found anywhere on this forum.)
Now, I've never smoked in my life, but for some unknown reason I figured that would-be ex-smokers would love an online calculator to see how much they'd save once they quit. Afterall, who isn't motivated by saving money, right?
Turns out, and this was once more confirmed by a thread in the off topic forum, that saving money isn't a big motivator at all. It was mildly interesting but nothing more.
It's no biggie. I've not lost any money other than what I attribute to an hour or so of my time. But it's a great reminder to not mind read your market and to interact with them more before embarking on any hairbrain schemes that may be totally wide of the mark.