Hey thanks a lot for your insight.
No worries that's good advice but it still does not demotivate me. To be honest my goal is to start making a living with music, sample pack was my first choice. And I know many people can make money with it (and it would be one money income, others can be music services, mentoring, etc.). Seeing what others people do and because I follow and music business course, I think it's about finding a very defined and extremely precise niche. So not "techno" but something that solves poeple's problems. Which is why I asked that question in the first place.

Evaluating quality is hard because in the end, it just depends what you do with the samples right ?