The number of bags you have is nobody's biz. If you can afford a million bags, tht's your choice. You've waited for 2 years for this FIRST & SO, so keep it. It's not as if you have a few white Birkins sitting in your closet, KWIM.
Your sis can SO hers, that's my opinion. It's an easy decision, don't agonize over it. Keep your bag. After all, you've already asked your DH for his opinion, doesn't his feelings count after he told you to keep it? :wondering