LOL....ok here is my opinion....
I only have a few myself.... a red, a burgandy, a couple of browns, a neutral beige, a french set, a few shades of pinks both pearl and matte and then a few bright colours....
About a dozen or so in total....majority of them CND.....
What I do myself to get over the lack of colours is rather than ask a client to choose....I make a suggestion....
''This pink will go lovely with your skin tone...'' etc etc....that sort of thing...
Then they will either accept it or say ''I would rather have that red one''
I find it better that way than to go in negatively saying you don't have much choice to offer them....
Anyway as a mobile tech I think it is acceptable not to have this vast collection....just have the most popular choices xxxxxxxxxxxxx