In an ideal world, yes you are right. But remember this is business. After all I am sure that is what REPRAPPER, a Chinese company, were also considering when they where designing their product range. On one hand you want to give people what they want but this has to be tempered by costs. We could develop a 10 or 12 new PLA colours and produce the stock for it and as we walk through the warehouse and look at our stockpile of 8-10 colours of unsold filament we can feel happy with ourselves.
A good place to start is to not assume people are in some way being evil or "horrible" because most people aren't.
But you are right, there are more skin tones than four and as we have said all along, and to quote our Flesh coloured filament product listings page:
Quote:
If we find that there is enough demand for "flesh" coloured filaments we will endeavour to expand our range. Remember, if you would like to get filament of a particular colour please let us know as we are happy to try and help.