Since January the price of bitcoin has more than doubled. I thought at $1,000 is was too expensive so I decided not to buy and wait for the price to go back to $600. Unfortunately, the price has since risen to $2,300 so I'm kicking myself for not investing sooner. I have a feeling that the price will go over $3,000 before the end of the year so I'm tempted to buy bitcoin using the 10K limit on my Visa. Is this a stupid thing to do?