The main reason behind is that this is the fact that tatoveringer using more than one colour requires more fine detail. The more detailed the tattoo is, the more the time and sources required to draw this. For the actual tattoo artists that cost a set price will need to be paid for the additional time spent on the actual skin image and so they may price the actual various colored skin image highly compared to 1 color tattoos.

It is advised to make use of well trained and expert tatoveringer designers