I would think it depends on the recipe and what it is for.
Thank you, yes! It is for a cake. Acustomer wants a white cake - she said that she ate one with cream cheese in it. I do not have a recipe for white cake with cream cheese. I may have to tell her I can't. She is bent on white cake with cream cheese in the batter.
This is a headache.
If someone says, 'We love my Aunt's chocolate cake so we want a chocolate cake for thus & such an event.' I explain that I'll be happy to make them a chocolate cake however I do not do legends*. There is no guarantee that it will resemble her Aunt's cake. In fact I am positive it will not.
Then, 'Well we can give you the recipe.'
OK, I charge $25 an hour to test recipes this covers shopping and travel time in addition to ingredient costs.' Then I can decide if it will work for your xyc event. While it is likely that it will not work, I take payment in advance minimum $250. Charges might exceed.
So I charge comfortably for headaches. Nobody has taken me up on it yet. 
*key phrase "I do not do legends"-- Please repeat as often as necessary.
http://www.grouprecipes.com/4504/cream-cheese-bundt-cake.html
This is for a cream cheese bundt cake recipe.
Thank you all so much. I told customer that I am not able to make that cake. But! wants me to do my regular white cake ... hehe. I know. Some people are so strange. And, my thing is you want a cake like Aunt Betty - why not make Aunt Betty make it..... hehe.
Thank you all so much.
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