Interesting project you've got going there...
I think Chrysallis are obviously charging you on the 'for profit' aspect of your project. I don't think it will be too much but it would probably depend on how many copies you are looking to publish over a period of time and obviously what kind of sales ratio you anticipate in your business plan for the project.
But, I couldn't for the life of me guess at any kind of figure as to what they may charge - this will certainly be interesting to find out once you have done the preliminaries with them.
Best of luck, and keep us posted.