Ahhh... thank you for clarifying! I was a bit confused about what you were getting at with your second sentence. Your explanation is very useful. I totally understand what you are asking now, and I would say that your second sentence isn’t completely wrong; I would just prefer the first sentence over the second.
Also, I think there is a better way you can phrase your second sentence. I would say, “Since you usually cover him, why don’t you just buy signature Slash products?” Other than that, your sentence isn’t necessarily wrong.
Does that help?