[bojan]

Kal, in principle I can agree with you about your estimate of potential users numbers, perhaps it will be a bit lower, and that will depend (among other reasons) on quality of the final product and of course, price.
The problem with future production may be the high price, as there will be no volume where those guys can find the room to keep the margin low.
Other alternative will be to compromise the quality to stay in the market (using cheap of-the shelf products, as David mentioned in his post earlier)
We shall see...

My problem here is that this is not the new technology and there still exist the need for auto-guiding in most cases, so I see something like this not really necessary. You can always find a suitable guiding star.. this is part of the challenge and fun in this game, right? And, easiest way is to go to the shop, spend couple of k$ and have that warm feeling inside..
Also, there are other ways to improve PE, for those skilled with mechanical tinkering (for EQ6 specifically, the replacement of gearbox with belt drive or even using better quality worm gear improves the PE drastically, for much less money).

Personally, I intend to stick to amateur philosophy in my astronomy projects: that means, I am avoiding commercial products wherever there exists a slightest chance of making something myself or using freeware from other amateurs. Even if it is slightly more expensive (I am prepared to pay for the fun I have here, you see :-)) In the same spirit, that also means that I will always offer my amateur advice and know-how (when I come up with something good enough) free of any charge, as it should be widely practiced in amateur community.