> 1. Add up all the sales you've made of your Wisp628 programmer since
> day 1. Subtract from that all your real costs (parts, assembly labor,
> shipping, returns/refunds, taxes, etc.). These are the real cash
> amounts you make/lose in building the units. It's a rough gross
> margin number.

Note: I sell mainly kits, so the per-Wisp628 labour is very low. The
assembled Wisp628's I sell are assembled by Olimex, not by me (OK, I put
in the chips and I solder a crystal). 

> 2. Now add up every single hour you've ever spent on the hardware
> design, software design, documentation for the end user and
> production, answering production questions, technical support (both
> online/forums and direct emails/calls from customers).

Yes, there is quite some cost in that. But I sell other things beside
the Wisp628, so a good reputation is worth some time spent.

As I said in another reply: the Wisp628 design is old, based on the yet
older WISP, which I made when it was all 'only' a hobby. So maybe the
equation would be different if I had to do a totally new design now.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 > 

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