Digital BW, The Print

I have showed my BW prints done with the MIS Vm, 1160 and CFS to some 
other photograpers in the country and they were amazed by the quality.
What followed is, as You propably guess, : many,many requests from 
them to print their photos on my system.
I have never considered this as a form of making money. I am firstly 
a photographer myself, but times are bad and why not...
Their next question of course was the cost. 
And I really don't know what to say. I can imagine that it is 
possible to somehow calculate the pure cost of the print and ink.
Let's say a 8x10 print on EAM would be roughly about 1 $.
But how do You calculate Your time?
Question:
Any listmembers provide that kind of service?
What are the rates?
I should add, that I am mostpropably the only Quadtone inkjetprinter 
in Poland.( The Hahnemuhle reps. in Poland told me that I was the 
first in the country to order Photo Rag!)

 Cheers
Piotr Janowski
piotr.janowski.agora.pl