Ed. - Update 2/26/18 - Now Amazon itself offers coaching to sellers, which stars at a minimum of $700/month for 3 months. I don't know how good it is, so I can't offer specific advise on their coaching at this time.
Also: I've collected feedback from readers, and my notes over the years. There are two coaching services they and I trust. They are legit and very helpful to customers. I am an affiliate of each, so I may receive compensation if you decide to hire them: Jim Cockrum Coaching and Robyn Johnson Coaching. My readers tell me Jim Cockrum's coaching starts at approximately $3500, and if you hire a coach and you are not having success, you have the option to be reassigned to another coach at no additional charge. My readers tell me Robyn Johnson's coaching's fees are affordable.
Do you think coaching services are worth their $3,500-and-up investment?
By 'coaching' I mean this: Many of my peers - Trusetd Amazon experts not officially affiliated with Amazon - currently offer one-on-one Amazon or eBay seller help that runs (generally) $3,500 to $10,000. He/she will spend a few hours a week with you (phone and web), for multiple weeks, hand-holding you during the selection or discovery of products to sell (via one or more methods like retail, wholesale, etc), where to look for products, how to buy, the entire listing and selling process, dealing with customer service issues, tracking your sales and profits, and growing your business.
Many of my readers have concerns with that coaching:
1.) They are not entirely sure there's a need. The 'nut' of what you're getting with coaching is hand-holding and step-by-step advice. But that's already accomplished to a great degree - albeit not a personalized one - with (for instance) the acclaimed Proven Amazon Course.
2.) Some think coaching can be overpriced. If I were to hire a coach for (say) $10,000, I think the coach should be doing everything for me for a short period (account sign-up, creating new products, finding me ideal products to sell, product listing, customer service, etc.) and then sending me videos/documents of all those recurring activities so I know exactly what to do after the coaching service ends. It seems most coaches don't offer that, to my knowledge.
3.) Because of #2, there can be a shortfall of expectations. I think clients of coaching may expect that by coughing up a large sum of money, that their success will be easy, fast and guaranteed. That's definitely not true. Even if you have the greatest Amazon coach, you still have to do the work. Selling on Amazon is a wonderful privilege, but it's not without its downfalls and it there are moments where you have to work very hard. But the pros of selling on Amazon far outweigh the cons, as it has generated tens of thousands of successful sellers (like myself) that now don't have to work a 'real' job.
I would LOVE to get some feedback from you, how do you feel about $3,500+ seller coaching? I want to be proven wrong.
P.S. The above is not intended as a slight to any current coaches out there.
P.P.S. Before you buy any coaching, you should ask for recent, verifiable testimonials from previous customers. If the seller of the coaching denies you that, that's a reason to be concerned about the quality of the coaching you're about to buy.