Yes, in a perfect world they could contribute those things but the chances of that being so are just too unlikely. If they could afford/justify any financial contribution, they'd probably just pay you to build it for them and have complete ownership.
If you have a bit of a track record, you will get people looking to partner with you and coast on your experience - in 99% of cases, it won't be enough to carry their part of the bargain or even be anything but a distraction or pressure.
Then there's the issue of feeling like you must persist with an idea you've lost faith in because they're still keen. Maybe you have countless other ideas to push that should be a greater priority, while this is their only bun in the oven.
If you have a bit of a track record, you will get people looking to partner with you and coast on your experience - in 99% of cases, it won't be enough to carry their part of the bargain or even be anything but a distraction or pressure.
Then there's the issue of feeling like you must persist with an idea you've lost faith in because they're still keen. Maybe you have countless other ideas to push that should be a greater priority, while this is their only bun in the oven.