|Why didn't you tell me all of these requirements before?|
Let's pretend you are a Project Manager for a major corporation and you gave your vendors half of your requirements and then sent them off to devise a solution. How much more do you think they would charge you to re-do the solution after you told them "Thanks, now add this, and this and this."?
It should be no different when you are getting free help. We have to set up spreadsheets, write code, test it, etc. We don't save every project we work on and when you come back with extra requirements we have to set up everything up again, test it all and re-do a lot of work.
If I have time, I'll consider working on your additional requirements.
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