I've been there, so please don't take this the wrong way, but yes, your hundreds of hours of blood, sweat, and tears may mean less than a hole in the ground. And why shouldn't it?
Your hard work on its own means basically nothing to anyone. People buy because of the perceived value to them of what they're buying, not because of what the seller did or didn't put into it. If people weren't going to pay $3 / month for your project, it's because you weren't offering them at least $3 / month of perceived value.
There is basically no connection that I can see between how much hard work goes into something and how much the market is willing to pay for it. Some people labor a lifetime on something that no one will ever want, others spend a weekend throwing together a website that will one day IPO for billions [1].
This is why so many successful startup founders and investors advise getting a project out there as quickly as possible and iterating rapidly to either find product / market fit, or to abandon it for something else. Fighting an uphill battle to make people want something that they don't care about, just because you've poured so much into it is a recipe for disaster.
Again, I've been there, so please don't take any of this the wrong way! Just my own rumination in response.
1. Yes, a lot of hard work goes into it along the way, but that's a hell of a lot easier with early success.