Maybe cause it's a bubble?

An "asset" with no intrinsic value???
Best to sell now before it gets to zero.
What did it for me was, as a US citizen, having to report all conversions of BTC to the IRS. BTC -> USD, BTC -> gold, BTC -> dinner .. all require IRS disclosure. Basically, it makes Bitcoin irrelevant as a "currency" if you plan on following the rules. Well played, IRS, well played.
I dont think so. You are required to pay capital gains tax at the end of the year. Who said you need to report all conversions?