why would any credit card offer incentive for purchase?
If you search around you will find that some credit card companies offer sign-up bonuses and other perks that are sometimes significant. An example is: if you spend $2,000 in the first 30 days of having the new card you receive $500 cash back. It is super tempting but that is the nature of the CC beast.
it is really very risky to use credit card or lend money to buy any cryptocurrency including bitcoin and and any altcoins. you may make profit with it but there is a very huge risk to loose everything.
I agree! The temptation is still there though?
Also if a person used the card to buy Bitcoin with no intention of every paying back the credit card debt, that is another thing. Once the credit card company starts hounding them, they will forward the debt to a collection service. If a person knew how to haggle with the collection service they could then pay back what they owe, but the payment could be for as little as pennies on the dollar. They would still own the Bitcoin while of this is going on. Everyone else here is paying top dollar for their Bitcoins but if you were a total trouble maker I could see using credit cards to acquire a significant stash of Bitcoin in scrupulous ways.