ah, the joys of an incorrect postif it is 11spd make account of the cost of the parts and esp front sprockets.
The 11sp and 10sp bikes have the same front sproket.
I'm guessing you mean rear cassette. But even this isn't much different, and will become the norm, where as 10 and 9sp cassettes will go up in price as they become more and more obsolete. Sram have 12sp next year and Shimano already have the patent for 14sp.
God knows how bad chainlines will be in the future.