i can apprieciate what ya saying by that, you have had to outlay alot of money for the PCB to be designed and made, and i can also see you point in that you are not the person who codes, and that it is a seperate person who is maybe not on the same lines/thoughts as you ...
and of course you want to sell all that stock that you have brought in and make money to get more stock and more devolopment etc etc
BUT i think u are under-estimating the DIY solution thats been brought to peoples attention, look at the number of people who HAVE brought you adapter, and also look at the number of people who are having problems with this MUCH MUCH MUCH easier soloution ! ..
do u honestly think that this DIY solution is any kind of threat to yours ! yours is like making a cup of tea to the DIY solution ! (just look at the above posts!)
just like 'cheapmods' tsop flashing, and softmods is/was/will never be a threat to the retail chips,
or the retail 'patch' mods for the 360 compared to the threat of the free firmware 'updating'
so yes u may loose a few sales to the DIY but you could say that these same people would/could of just used the exsiting 8163 and not just brought a new drive and your adapter

after all, the people who do 'make there own' maybe at more of a place to actually help you

so you see, all that you are doing by stopping more firmware support for already exsisting customers , and future customer of yours, is going to be detrimental and make you look like the bad guy, as looks like wrongly they have

people int gonna buy these if they are going to be quickly outdated and NEVER really be a true 'replacment' for xbox (the non modded console crew) i think once you get that in the firmware you work will be done

hopefully you can see both sides of the fence, and see that DIY is no 'real' threat to yours, Mick ....