50 / 50 Is NOT a good idea!
I can understand you being upset with these replies. They are being offered as "truths" when in fact they are only opinions. A person coming to this site looking for advice is looking for support, or suggestions, not ranting. If these people don't have advice that is useful, then they don't need to reply.
I have seen 50/50, I grew up with it, it was awful. A child needs stability, not being tossed back and forth like an object. If the mother is not capable of giving the child a stable home, then prove it to the courts and let her have visitation. A child needs a good, stable loving environment. And all of this talk about money has NOTHING to do with it!
Good luck!