In that case Jazz, I'm not sure why you are frustrated?
My objections are contingent upon there being some malice and in light of your words being of no such thing, they are not levelled at you and I will take responsibility for jumping the gun... however, I will to some extent continue to offer some opposition to your putting the fear of god into any souls that wish to use this site to "dip there wick" into the world of manufacturing.

I am not offering legal advice and I am not advising people to "avoid" or ignore the conundrum twixt "dipping their wick" and taking the piss.
It is a subjective shout on the side of the hobby manufacturer to draw a line between hobby and money making tax liable business.

We ALL already know that the law is a blunt tool in that for all intent and purpose it would hold that your granny is liable if she decides to sell that jumper she knitted for you on ebay....
Somewhere between knitted jumper and IPhone manufacturer there is a line and common sense "should" have folks have at least a rudimentary idea where that line is.
Personally (OPINION) I would draw the line at skimming money from the hobby/business to spend on items that are unrelated to the building or running of that business excluding any grotesque asset building/collecting.

I DO NOT advise anybody to do as I say or do... I am only offering my thoughts on the issue of the hysteresis loop between grannies knitted jumper and the Iphone manufacturer.... how many knitted jumpers can granny sell before she is taking the piss?
There is an answer but unfortunately, it is a subjective one.