Every time I say that I regret using BTC for purchases, I can't help but feel like I'm "betraying" Bitcoin by not supporting its use as money. Laszlo Hanyecz comes to mind. At the same time, Bitcoin has become so important and so valuable as an asset, that spending it on petty purchases just doesn't feel right anymore. It's like cutting a piece of gold from a gold bar to pay for your weekly supermarket shopping. I'd rather use fiat for that. Perhaps, there may come a time when the mere ownership (and not the spending) of Bitcoin will grant the owner special privileges. Bitcoin is just too precious to spend, unless absolutely necessary.