Think about that again: if you're a software developer $500 is like what, 5 hours worth of work? You only get one chance to validate this, so you'd better do it

Think about that again: if you're a software developer $500 is like what, 5 hours worth of work? You only get one chance to validate this, so you'd better do it right. After you've spent $10000 or more in development time is not a good time to find out your product idea is fundamentally flawed.