This number is correct. Though, you do need to round up to $2205 USD because the lowest amount of gems you can purchase is $5, not this $4.77 lol
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Maybe the idea was for you to start farming lvl 11 walls at TH 10 so by the time you get to TH 11 most will be done and you can enjoy the electric theme. Could you imagine having to start farming lvl 11 wall after upgrading to TH 11 (if they keep the electric theme), lava walls would look so out of place!
don't worry, they all have "sponsors" lol
The blue might...stand out a bit but I don't mind the walls too much.