Nukers seem limited on the amount of raidpoints they have as well, so I did see a couple of public Galaxfies time out as well.
As a rule of thumb, I don't waste my raidpoints on bosses that haven't been hit (decently) by whoever spawned them. Those have a bigger tendency to timeout, since their owner simply isn't really invested in its demise.
There's plenty raidbosses of all types going round to simply skip those leecher-bosses. I'd rather help someone who actually tries to get his RB killed to get those spawner-bonus items, than help someone who just wastes some common eventcurrency to let others do the work.