I think it is a valid statistic in a game devoid of statistics.
If I am looking at someone's profile, I am just as interested in a lot more than just the leave count. What about games played in each class? Won/lost? Kills as each class? Times shooting each gun and respective accuracy with each gun. Games flying each ship, and the win rate with each. Players vary between humble and arrogant, and having stats to attach to a player would help me adjust my loadout a lot more. A player saying they are a crack shot with a hades when the numbers say they aren't will tell me to put someone else on my hades, or not bring one at all.
Naturally numbers lie, especially with the rate at which I order my crew to fire on allied ships, but numbers are a decent indicator when we have none.
TL;DR: Remove it, or give us more statistics to go along with it.