Your wife evidently has Compulsive Shopping Disorder (CSD) stemming from a lack of emotional and physical intimacy at home. Clearly, you have been, how do I say this, lacking in your marital duties. Your wife compensates by seeking pleasure through attaining things she thinks will satisfy her.
I suggest that you seek out a qualified therapist to address your inadequacies. And don't be afraid to ask for help.
Good luck.