You can not buy anything with prestige points. You only buy with skill points and that has no downside. Also, all the really good skills tend to only cost 1-5 points.
how is the auto pin % calculated? if it includes the pins you craft then it should not since crafting costs increase; otherwise you should just never craft until you get tones of pins first...
spark vs potion; potion doesn't seem to change CPS though you'd need it to be CPM with the enemy CPS and your teams HP taken into account then you could math unorthodox support pins...
Its hard to calculate CPS with so many pins, stats and supports. Same with formations: turtle formation will have a not big CPS but with its bonus its CPS is probably x2 x3 or x4 times higher.
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You can not buy anything with prestige points. You only buy with skill points and that has no downside. Also, all the really good skills tend to only cost 1-5 points.