You see, this is why I would get really annoyed if somebody had the nerve to demand how much my accessories cost. It's so hypocritical. There is every chance those people spend money on holidays, expensive hobbies, or perhaps large quantities of cigarettes or alcohol. And those forms of expenditure represent money down the drain, but an LV bag can be sold for a good amount of money should you decide to let it go.
As for the boobs, depending on which kind she had they may not last much longer than a good-quality handbag. Plus she will have to spend a small fortune having them either removed or replaced.
You could say something along the lines of 'thank you very much for your judgement, and your unsolicited feedback. By the way, I see you have fake boobs. They must have cost a lot of money, and they look great. It's a shame you can't sell them if you get bored of them, but that's not the point - the point is that YOU enjoy having them, right?'