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.
I never fell regret when ever I sell my bitcoin because I always sell by bitcoin when its price become high because Im doing investment here and I buy bitcoin when its price is low and then I sell it out when its price go high so t give me profit and when I take my profit the I also use my bitcoins because you can use bitcoin for your daily expanse and then when its price go low again I buy bitcoin so buying and selling is a part of business.