Some of the ga matches include ships. I'm assuming the reason they just include total gp instead of separating it is necause that is much easier than changing the algorithm for match making every time just because they put some variety in the event.
We haven't seen a repeating cycle for ga yet so there may be one that weights ships pretty heavily in the future. It is hard to do with only 4 capital ships. The most they could do is 4 fleets total. And you'd have to trim down the reinforcements to make enough ships for that.
But in the end it may all balance out.