* private transactions: your identity need not be associated with donating to wikileaks or buying a sex toy
* irreversible: no chargebacks or transaction reversals
* unseizable: protection against civil forfeiture, IRS account seizures for "structuring", etc
* remittance: send any amount of funds anywhere in the world with minimum fees with no 3rd party ever having access to funds
* exit from corrupt monetary policies: see Argentina, Venezuela
But apparently these don't apply to you personally so it may be best to continue swiping your Mastercard™.