While their teleportation ability is not special, theirs has reached its most powerful form, such that only a complete seal in space and time can stop them from teleporting completely. That kind of seal is the one used to imprison CARNAGE.
Even then, it is not certain that they can be blocked from teleporting in light of the effect of Legion-5's Cosmic domain. No other Origin god possesses it, so no one has enjoined the kind of success they have had in robbery.
Not only did they gain wealth, but all the fighting granted Legion-Unity the opportunity to practice his abilities against other Origin gods without holding back. It has allowed Legion to learn more about Cosmic force and his cosmic domain.