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I just guessed, at the beginning he must have regretted it, because humans must have regrets, especially after seeing Bitcoin currently becoming one of the legends in the Cryptocurrency world, even with a very fantastic price. But slowly he will definitely not regret it because he is the one who commemorates Bitcoin Pizza Day, and right this month we will commemorate that day on this forum
Bitcoin Pizza Day Contest and this has become a habit every May.
On the one hand, maybe he slowly doesn't want to regret it anymore because like you said. He bought it using bitcoin because at that time bitcoin was not valuable, even because buying pizza with bitcoin was the first transaction if I'm not mistaken in buying and selling, maybe if he didn't buy pizza using bitcoin, bitcoin wouldn't be like it is now. So actually he didn't lose anything, besides that bitcoin at that time had no guarantee at all. Bitcoin was still very small at that time and could fail, maybe if we were in his position at that time we would do the same thing.
Laszlo has been interviewed many times about whether or not he regrets buying 2 Pizza with 10,000 BTC, he said he does not regret his decision. The answer makes perfect sense to me because no one ever knows what will happen in the future. Logically, at that time he never knew Bitcoin would become the number 1 crypto in the world with the highest market capitalization.
Another reason why he has no regrets is because Bitcoin miners were relatively efficient at the time, so he could easily generate more Bitcoins. Regardless of his feelings after learning the current value of Bitcoin, his story is one of the important moments in Bitcoin history and an important lesson for all of us to be more careful in making decisions and appreciate technological innovations that may change fate in the future.
Here's a cointelegraph interview with Laszlo about his feelings after paying 10,000 BTC for two pizza.
Bitcoin Pizza Guy: Laszlo Hanyecz on Why Bitcoin Is Still the Only Flavor of Crypto for Him/url]