If the designs are of good quality, $70 is really cheap, actually.
I do design/photography work freelance, and most of my work runs around $100 minimum (usually for larger-scale projects, but still).
If you look around for market prices, that's selling myself cheap.
It may seem like a lot for a new YouTuber, but you have to take into account (potential) college training, experience, etc.
As in any trade work, you're paying more for the background skill rather than the product itself.
I do design/photography work freelance, and most of my work runs around $100 minimum (usually for larger-scale projects, but still).
If you look around for market prices, that's selling myself cheap.
It may seem like a lot for a new YouTuber, but you have to take into account (potential) college training, experience, etc.
As in any trade work, you're paying more for the background skill rather than the product itself.