I don't care about football, but I love this game. I'm glad to see that you guys are working on the energy and are listening to the fans! I wouldn't find the energy such a problem if maybe there was a game mode that let you practice your skills in a way that maybe it didn't go towards your football rating or match fitness.
I think some of the stuff is a bit pricey. If this was a free to play game I would donate a good bit of money towards this game because it is just so well done. Though I will be buying some stuff to help out the developers I hope you adjust some of the prices! When you unlock achievements there should be a reward for it, whether that be coins or a pair of boots. Thank you for listening to your players!