We use inksoft on our website, but it represents about .05 percent of our business.
I plan on redesigning our site to feature better products, and make it load faster (inksoft api is slow)
We did just run a fundraiser that had 40k dollars in sales (preorder store)
However, the amount of people that order online is very limited, and mostly small quantities. To be successful with automated online sales you need to market it, which we don't.
Of all the orders (100's over a couple years), I think one or two used clip art or the inksoft design templates, so unless you are Custom Ink and suited towards people who have never bought custom apparel, most of our online orders had people upload pdf / svg files to complete their orders.
We could however use a shop management software that was embellishment based, had proper scheduling per machine, good quoting tools, and a backend where customers could initiate reorders from previous customer service based orders would generate more online usage.
However if you are trying to spend time implementing a designer into Printavo I think you should spend time to make your software more suited for a production shop that handles hundreds of orders per day, and implement a very simple mockup generator (overlay SVG on Raster Mockup (S&S Garments)) that can enable people without art experience (or customer) to create and make simple edits (placement / size) to mockups and can avoid the back and forth between art -> csr -> customer -> csr -> art -> csr -> customer -> csr -> art (approved) to make a simple edit like moving the graphic down an inch.
Our art department which is some of the highest paid people, spend a lot of time doing menial tasks like copy and pasting a vector graphic onto an image to make a mockup.