#1) it doesn't pay any dividends like stocks
#2) risk of extended drawdowns which could cause loss of principal unlike in a real estate investment where the property only goes up in value
#3) unfavorable tax treatment since it cannot be depreciated like many types of assets can be when used for business purposes

the fact that it doesn't pay any type of periodic cash flow while it is owned is a serious issue. for these reasons i don't really like bitcoin as an investment.