If i knew about it then i would have invested a lot more than that without thinking twice.The only issue that is currently popping up is the scaling issue and i am not sure how smooth that is going to go and if it is not done properly then it will be a disaster and you would see people loosing millions too.
Who wouldn't? But i salute people prediction skill who invested a good amount of money in initial state of btc to think it will profit them in a large scale.
Also after investing in 2010 there was a time when couple of years back it had reached 1000$ for first time, so might be many would have already sold . Not sure how many actually still hold btc who had invested in 2010 and did not sold yet even after 2000$ + it has reached.