Gotta laugh at the cash cost to buy gems
Looking at the two highest tiers:
2,500 gems for $57.99 = $0.023196 / gem
5,200 gems for $119.99 = $0.023075 / gem (advertised by Rovio as the "Best Value"!!!)
Doing the math:
5,200 x $0.023196 = $120.62
Yup, that's right. You save a whopping $0.63 by buying the highest tier of gems!!!!
Hooray!!
/facepalm
On the bright side, at least after the latest ABT update it costs fewer gems to do an "instant" upgrade on a TF.
For example, IIRC, it used to cost 3,000 gems to instantly upgrade Goldbite Grimlock from L9 to L10, but now it "only" costs 842 gems.