I went through several "splurge and purge" cycles. Then I stopped. My reasons:
1. These are my clothes. I'm not going to throw them away.
2. Crossdressing is a strength, not a weakness. If you doubt this, think about how much courage it took to start shopping in the ladies department. How much courage it took to go out dressed in public, etc. That's strength, not weakness.
3. Back during junior high when all the other girls were getting boobs, I prayed every night that I'd get boobs too. Now I've got breast forms and a ton of bras. I finally found a way to look normal. Getting rid of my bras and breastforms is unthinkable.
4. I got old enough that I ceased to care what other people thought of me.
5. I like myself better when I'm en femme. I can act natural and not have to worry about appearing "unmasculine."
But there are some reasons to purge (partially).
1. My closet is so jammed with dresses that they hold themselves up without using hangars.
2. The things I don't wear anymore outnumber the things I wear regularly.
3. Things wear out.
4. Significant weight gain, or loss. (Hopefully loss.)
5. Changing styles. (A few years ago it was solid pomegranate everything. Now it's flower patterns. And leopard patterns.)