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.
Buying and selling is a part of business some time you will buy and some time you will sell because bitcoin is a very good currency to buy and sell and if you want to sell bitcoin so it also give you a profit because bitcoin is always trying to give us profit so no need to worry about selling because its good to sell bitcoin and when you get your profit then you can buy bitcoin again because bitcoin change its price fast from low to high.