Eh, I don't find the energy mechanic too troublesome usually had enough for the time being by the time my energy run out. I would rather you make your money here then elsewhere, but if energy refills are proving bugger all profit removing it might generate some positive feelings for the game and result in more purchases elsewhere, as well as going a ways making hte game seem less like a facebook game and more like a real one.
Up to level 39... wondering about the wiseness of my investment into a cash gun... my machine gun is obliterating everything before it gets close enough for my cash gun to hit....
 "Yu-Gi-Oh! BAM"){kind=icon}
 "Walkinator"){kind=icon}
 "UPGRADE COMPLETE!"){kind=icon}
 "Use Boxmen"){kind=icon}
 "Eternal Red"){kind=icon}