Card Set Values [Answered]

I just have one question about card set values, and this may have been asked before, I'm not entirely sure...anyway:
In a flat rate game, a red set is 4, green 6, blue 8, and mixed is 10.
My question is, why is a mixed set worth more? Technically if you look at the probability of getting a mixed set versus a colored set, you're more likely to obtain a mixed set:
Colored Set: [Any 3 Colors], [1 Color], [1 Color]
Mixed Set: [Any 3 Colors], [2 Colors], [1 Color]
Therefore, the probability of getting a colored set is (1) * (1/3) * (1/3) or (1/9), and the probability of getting a mixed set is (1) * (2/3) * (1/3) or (2/9).
So if you're twice as likely to obtain a mixed set, why are they worth more than a colored set?
In a flat rate game, a red set is 4, green 6, blue 8, and mixed is 10.
My question is, why is a mixed set worth more? Technically if you look at the probability of getting a mixed set versus a colored set, you're more likely to obtain a mixed set:
Colored Set: [Any 3 Colors], [1 Color], [1 Color]
Mixed Set: [Any 3 Colors], [2 Colors], [1 Color]
Therefore, the probability of getting a colored set is (1) * (1/3) * (1/3) or (1/9), and the probability of getting a mixed set is (1) * (2/3) * (1/3) or (2/9).
So if you're twice as likely to obtain a mixed set, why are they worth more than a colored set?