I\'m done with being nice!!!

So for the past couple of months I have been helping out a friend of mine (at least I thought she was a friend). She has a 1 year old son and works full time. I'm a stay at home mom so when her other babysitter decided she was moving my friend X asked me if I would watch her son. Actually, let's start this over. Friend X had babysitter A, babysitter A went to take care of her parents, I was asked by friend X if I would watch her son while babysitter A was gone. Sure I'm thinking it'll only be a month or two. And I offered to do it for free or a pack of ciggy's every now and again. Well a month into it I find out babysitter A is actually selling her house and going to "travel" with her hubby. So now I'm babysitter A. Friend X didn't even ask if I wanted to continue to watch son, just assumed I would. Course it is partly my fault, because I should have said something. But really hasn't been a problem. We (the hubby and I) really like this little boy and our son get along with him really well and it's nice for someone for our little guy to play with.  This is what finally pissed me off the most. Friend X started working full time from part time (this isn't the problem), okay no big deal. She even offered to start giving me some $$ since she doesn't have too many bills. Cool! I think sounds great. Well today she came over earlier to hang out before she went to work, and just happend to tell me that she bought baby's daddy a PS3 for father's day. Now it really isn't my business how she spends her money, but she knows how hard we are struggling financially right now, she knows I've been trying to find a part time job, and she goes and drops $350+ on a fucking game system for the kids father that keeps leaving her!!!!!!! While I still continue to not see a dime or even a pack of ciggy's from her. Okay I lied I've seen $20 and 2 pack of ciggy after watching this kid amost 40 hours a week for over 4 months now. If I charge her $30/day she owes me about $2400 and instead she buys daddy a PS3. I'm so pissed!!! I'm so tired of being nice and trying to help out other people, only to be walked on. I'm so fucking sick of self centered people and just doing things for themselves and fuck everyone else.  Well fine I can play that game also. Fuck it!!!!!!