They don't tell you to buy any Razer products, they demonostrate what they use to compete in local tournaments, and at home. Being a professional gamer entitles you to professional sponsors, this specific group of gamers being sponsorsed by Razer. They aren't telling you to go and buy them. They simply present what they are using, and explain the pros and cons of each of its abilities. It's more then just that guide; they offer a lot from Professionals showing how they play, and offering 1on1 tutorials, tips, and help.
Subscribing to their premium services comes with great benefits that you can't find anywhere else. It's innovative and a great opportunity. If you don't find professional gamers offering their help a cool thing to take advantage of, then simply don't participate.
I don't understand why you proceed to criticize them for no reason. Yes, they are sponsored by Razer. Yes they have Razer pereiphs; that is minuscule as to what they offer as a whole.
If you are the least bit concerned with the game play such as aiming,recoil, stategys; site taking, rushing, how to use smokes,flashes, nades the most effectively at the most competitive level in eSports and just loads of information the casual gamer wouldn't know, then give it a visit.
Why the hate?
& They would certainly help you with any questions, this guy obviously is against the community I recommended for help.