I think the previous post wasn't literally saying they would be okay with someone purchasing a solution. Just that it's okay if they had help with the problem, even it's quite a bit, as long as they actually understand the code.

I can't imagine a scenario where a person can't solve the problem, so hires someone to do it, then explains it as well as the person that actually wrote the code. If you can explain it that well, with reasoning for tradeoffs and design decisions, you might as well have written the code yourself and saved some money.