I just regret knowing about it and never bought due to lack of full comprehension of the mechanism behind it, like many people I suppose. I remember when i bought my gaming rig in late 2009, I'm been interested abut mining bitcoins for a while but get bored by technical issues and very little reward so I just forgot the idea. It makes me wanna die every time I think about that.
Lol. Not buying at all is a whole new ball game entirely, but there is nothing that cannot be changed, the only difference is that you only extended the time it could have taken you to be made by now.
No one knows the future and I am sure a lot of us based our decisions totally on that which is human unless you are extremely principled which everyone should anyway. Nevertheless, sometimes, we do always wish we can change back the hands of time, but since we cannot, we just have to move forward and re-fix the future to our best.
No I will never fell regret to sell bitcoin because bitcoin is here to use bitcoin is a digital currency and every one must use it its price is very high in my country and its profit is more than enough for me in its profit I can buy a lot of things and still some money left with me so if you dont want use it and want to keep it save with yourself so end of the day will sell when its price go high which can also give you a profit so no need to worry about it.