I should give more details about my original post. To be clear, I am a part time poker player. I play mostly CG at 10NL and 25NL This post was not about coaching (even though, I do coach a little).
Over the past couple years, I have accumulated quite a few poker courses and I am just offering them for a very cheap price.
To answer your question, I do believe those courses help you become a better poker player. BUT being a great poker player is a whole. You need to work on your fundamentals, review hands on a regular basis, have a study group and, last but not least, work on your mental game. Poker courses are just the beginning of the journey.
Welcome to the forum, always nice to see a new poker player here. From your posts here it sounds like you are just looking to resell poker material that wasn't actually created by you. It would be nice if you give more information here about what kind of material you are selling. Adding the information to your initial thread will save you also a lot of time answering emails. The internet is already full with poker material, are you selling videos course material from big schools? There are quite a few poker schools out there who offer coaching sessions with the world's top poker players. For such kind of courses you have to pay thousands of dollars, would be nice to get it cheaper. But I am not sure if it's legal to resell it. Personally I learn better with a teacher than just to read books, that is why coaching sessions would be much more attractive, if they are cheap.