>>212445539It's made quite obvious throughout the series that the Wraith as a species are in a state of perpetual near-starvation due to inflating their numbers to ridiculous levels in order to stop the ancients from extincting their entire race.
So they've spent the last 10,000 years mostly hibernating and only waking up and eating just enough to keep themselves alive before going to sleep again.
The whole galaxy sees them as assholes, rightfully so, but for the Wraith themselves it must seem like some kind of hellish perpetual limbo that has come to define absolutely everything about their culture. Hives, queens, territory, absolutely everything they do is based around the need to feed because they can't afford to waste their limited energy on anything else.