Last October a website called BTCBurns.cf identified 397 burn addresses containing 2,657.8686 BTC lost forever. It has gone offline. Since it stopped keeping track 26.04 additional bitcoins have been sent to these addresses.
The total number of unspendable bitcoins is now 2,771.4086.
http://bitcoinwhoswho.com/blog/2016/12/21/btc-burn-addresses/2771BTC in total, that is a fortune but is this act intentional or a mistake, how can they be sending BTC continually to a dead address.
Some people just burn some of their Bitcoin to increase the value of it overall, and to be fair 2771
BTC isn't a small amount and it is worth a huge amount.
As for everyone who thinks that the bitcoin really is lost forever, though, it's far from that. It'll take a long time to get to the address, but I would be willing to guarantee that someone will find it at some point. Assuming someone seriously undertakes that goal, though.