I believe that in a few years, when Gulbis has no ranking anymore, has seen the parties, has seen what it's like to have a blond, or a brunette, a H cup or a B cup, he will regret that he gave up on a great tenniscareer for it.
Sure you are young only once, so I don't ssay he shouldn't party. I just think he could have done with a bit less. Take off twice a year, party for a week and start training again, let yourself have 1 or 2 days each time you're in Latvia, but seriously, an athlete should not go out partying for a full week after he played 1 good tournament, with the next tournament already waiting.
Party's are fun, but once he gets bit older and settles down, I think he's likely to regret his decisions.