I've been watching a lot of bare knuckle boxing and MMA these days, mostly while riding Torture Bike.  I get a lot of bare knuckle boxing on YouTube for free.  I find it entertaining enough to distract me from the drudgery of a stationary bike but it's something I would never do for sport.  Why?
     Because it's stupid.  Why would you do something that's going to damage you for life?  I've been into martial arts since my teens.  I've participated in all sorts of fighting for sport, exercise, training, etc.  But I just plain wouldn't do full contact bare knuckle unless I found myself in some sort of situation where I had to.
    People are very fragile. Especially facial bones. It's very easy to do serious damage to someone if you know what you're doing.  The last time I was in any sort of real fight was when I was attacked by a prowler outside of the duplex I lived in before I bought this house.  During the fight I shattered his left eye socket with a jab.  Not even a power punch, just a good hard, straight jab. 
     I don't know how something like bare knuckle fighting gets sanctioned.  It's too dangerous IMO.  I feel bad for the participants, who are mostly MMA has beens.  They must be really hard up for money to subject themselves to that sort of abuse.