I am with Stupider and Stupider does, butt I am the Stupidest! I first fully upgraded the DR 1 and added two paint schemes to it not realizing there were more planes after that one, Duuuuuhhhhhhh.
So I scroll all the way to the right and saw another plane, upgraded that one and added two paint schemes. So I got giddie like a school girl at Prom and went to the Allied side and went scrolling to the right, saw the next plane, the SopTripod, I mean man a triple winged Allied plane!!! Went upgrade crazzy of course and added two paint schemes. Then I saw I could scroll further to the right and saw the SopFormula 1 plane. I called Michael Schumacker saying I died and went to options heaven. So I started to upgrade that one, got as far as the third engine speed upgrade and then it tells me you don't have coins dude, I take a look and I have 50 K! Uhhh, poopsickles!!!!
So I go into game thinking have at ten bombs, millions of bullets, my speed must be at least 200000000000. Uhhh, hmmm, yea, well uhhh, not exactly. Still have the same speed, same number of bullets, I drop a bomb on the hangars and my bomb counter shows zero. I am like WTH! So I look around for a hidden armory, yeaa uhh no, maybe a secret tunnel?
So I spent 6.98 Million and change of my df coins! I upgraded one of my German planes thinking I had that as the top tier plane, upgrade the next to the top tier Allied plane because I think a tripod is cool and I should have plenty of coins for the next one, run out of DF coins upgrading only four bars of the engine on the Formula 1, Top That!
Yea that's right, who is the Stupidest of them all now huh!
So look before you buy, do not buy bomb upgrade kit, it is not available to be used in game, or maybe it is supposed to work differently, like a bigger bomb effect?? Maybe it blows everyone and everything up in a certain radius??
So be careful out there in options land!
EDIT: The two bomb upgrade option bought today will be available for in-game play in one of the future updates
but not for current game play! So do not test the Bomb Radius Explosion Theory, well, can't hurt