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And not to mention that it's easier for him to increase his funds. If he doesn't buy anything than Fire Sale is useless. And if he uses Gold Rush thats even more money, because he won't get any extra for not buying units (relative to Gold Rush vs Fire Sale).
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Nope. Colin should take Fire Sale. It's time for math class, folks!
Say a player can only spend money he's raised through cities (which is true for any CO not named Sasha). How much purchasing power does 10 cities get him?
A normal CO has 10 cities * 1000 = 10,000 credits. That's easy. A CO with Gold Rush has 10 cities * 1100 = 11,000 credits. That's easy too. A CO with Fire Sale has 10,000 credits, but his discount gives him 8% off. He's thus paying 92% for each unit. This is equivalent to having an income increase of 100/92 credits. So that's 10 cities * 1000 * 100/92 = 10,870 credits.
Thus, regular COs are better off taking Gold Rush. What about Colin?
He's already paying 80% for his units, which is equivalent to 5/4 more credits. So normally, he has the equivalent of 10 cities * 1000 * 5/4 = 12,500 credits. With Gold Rush, he has 10 cities * 1100 * 5/4 = 13,750 credits. With Fire Sale, his discount goes up to 28% off, which means he's paying 72% for each unit. Again, that's equivalent to having 100/72 credits. So he gets 10 cities * 1000 * 100/72 = 13,889 credits. Thus, Fire Sale is better for him economically.
To get a better grasp of why you can't directly compare an increase in funds with a decrease in price, ask yourself this: would you rather have 100% more income, or have 100% off every item you buy?
Colin's COP is irrelevant because it's a straight multiplication of effective purchasing power: you can buy 1.5 times as much stuff regardless of whether you have more income or a bigger discount. It factors out of the comparison. (OTOH, your COP meter does charge faster if you're using Gold Rush, since your units are more expensive.).
Colin's SCOP, on the other hand, would tilt the calculation toward Gold Rush. "Effective Purchasing Power" doesn't matter; all that matters is the raw credits you have accumulated, and thus Gold Rush would give you 1.1 times as much of at attack boost. However, I don't think anyone uses Power of Money until they're cleaning up anyway, so I don't think that should form the basis of your Force selection.