I think the best way is to go "cold turkey" and get rid of the purses altogether. I did it, so can you. My hub about being "purseless and proud" gives details, but the focus is on being libereated from the useless anchor we used to carry around.
No really, to take a serious stance on this, when people find themselves needing to buy things because it makes them feel good, but it causes turmoil somewhere in life then the action has to be examined.
Example: If a person is buying purses they don't need, but there's this moment after purchase where it fulfills a void then they need to examine that void rather than focus on the purses. Our society tells us that it's the action that is problematic when it's usually the empty spot inside that propels us forward into action that is dangerous, whether that be financially, emotionally, physically, spiritually, and so forth.
Whew. So. Nothing wrong w/carrying a purse or bag, but if it's interfering in your life (guilt, hiding purchases, obsessing, compulsively buying) then it's healthier to finance fixing the reason you stuff yourself with purses.
Or you can sell your older, less used purses. If you know a lot about them then turn your knowledge into money. But, if buying is really a problem figure out a way to limit yourself rather than go into debt.
Create a website for purse addictions. You could encourage viewers to post how they got over their additions. They could also share how they manage their need to purchase another purse. You might start something and find you are not alone!