Most times as humans we feel more regret for the action we didn't take than the ones we took.
25 October 2011 he was happy that he didn't buy Bitcoin when it was $2.70, but comparing gap in price between then and now, is quite a lot to feel regretful.
So in my own opinion, now is not too late to buy Bitcoin because it's still in it early days, and am quite positive that in 10 to 20 years time from now, Bitcoin has the capability of doing 10x to 15x of it current price, so it is best to act now that the opportunity is still there.
Who can be more regretful than Laszlo Hanyecz who made the kind of regretful his by using his 10,000 btc worth around $41 dollars in 2010 to buy just two pizzas.
We all have had such decisions we made to sell or exchange btc for fiat or buy something directly. If we check the value of those weekly btc earned from campaign and see what they are worth now then we can also see a huge difference.
But the point is will that be a regret? I don't believe you have to have something to sort your financial need out and you hold tight to it to risk your health or life.
Except you sell your btc for frivolities without proper utilization of
of it then you can regret. If you have used your btc to help yourself on your urgent needs, I don't expect that to be regretful.