In my case nobody in Canada or in the US (including Starline themselves) stocks the 38 Super Comp. I called Double Tap and asked if I could order some, Josko declined a deposit even with me offering and said he would notify me when it came in. I received a call a few months later (about what is listed on Starlines website for backorder time) it was shipped out and billed only after it was ready for shipping.
I personally would want a deposit on less common brass because I am sure there is always somebody who "changes" thier mind and leaves me stuck with it. I am sure most would want the same. Only if I was sure if it was a high demand item would I be interested in adding it to my inventory.