I can see the value for non-tech-savvy users. Simple (to understand) product, clear description and instructions.

For non-price sensitive products (i.e. the type of products you'd expect to be developed and sold on line by small / indie producers), the 5% cost of payment (Stripe + Trolley) can be factored in the price without too much pain.

My main question is how many potential customers are there, who aren't already selling through a complete platform such as Etsy.