I have close to a 100. My wife has stopped believing the "it's a demo that I will soon sell" line a while back and of course she sees the credit card statements as well.
After every big splurge, I take a break for a few weeks to get things back to normal. There is no long time solution to this issue though. Recently I succumbed to pressure and sold about 10 and after a week, spent that money to buy another 12.