Alz I appreciate your suggestions thank you, my thoughts below:
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Perhaps say a 1% fee?
It's just not enough to make me not want to go watch Dr. Who instead.

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and instead of in the form of paying extra its you get 1% less?
Interesting thought, but most people have an exact amount of CTP they want. This way, you have to do your own math. The other way, I do the math for you; easier and less confusing.
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Alternativly maybe a flat rate instead of a % fee?
What do you think would be a fair flat price?