Well, one should also ask how many people gave themselves a nice pat on the back after reaching a milestone, and then went on to achieve another sober milestone, and then another sober milestone, and another, and another . . .
Of course, there's nothing wrong with suggesting that humility may be a good course of action to help maintain sobriety, but taking a little pride in one's behavior and accomplishments is hardly "an extreme emotional high". IMO, it's a good thing.