I tried TeeSpring way long back but made only a few bucks from it. It requires a lot of promotion. I liked your 1st point because I know based on my experience with teespring.

I initially designed it my own but later colab with someone for the design and that got some success may be at that time I did some promotion as well that led me at better position.

Anyways I'm grateful to you that you always been so helpful to me and others. I love you @jerrybanfield