Dude, I'm guilty of letting things go to keep the peace in my M also. I need time to think this through, but I think you definitely need to have a discussion about better communication in regards to S5, particularly when it costs you money.
My W is the residing parent, although we have joint custody Thank God, and it seems to me that she behave similarly to your W. The K's seem to get watched and spend a lot of time w/ other people, mostly MIL/FIL. W bought S5 a Nintendo b/c he wanted one, but I suspect it was b/c she needed something to "babysit" him.
