I like the photos I htink one thing I see others critique about is keeping the subject in the photo.
I see alot of feet chopped off and no ball in play or a partial ball. I'm sure the action is fast and it's hard not knowing what you captured until you made it home and uploaded the pics. Some would make good crops of facial expressions and so forth. But alot to me lost the theme w/o the ball in play.
Now as for buying equipment. Everything in my signature has been purchased since May plus had and sold a 30D and alot of misc items not listed. This is expensive for sure.