customizing channels

SImply put, I was considering running an Ad to see if I could bring more viewers to my Youtube Channel, I made an Introduction Video for What i do on my channel and created a very cheap ad that ran for 1 day. I got a comment saying "You really paid Money to advertise this" and gained 1...

What's your icon and banner like? Have you had them for a long time, or do you change them regularly? Did you make or edit them yourself, or did you commission them or the like? How important do you think they really are? Have you set up a trailer? Did you make a new, specific video for it or...