Barely never. Its like people screaming that the worlds about to break due to terrorism when terrorism is at its lowest level in decades.
People scare mongering about Open are usually players that don't play in Open. Over the weekend i went to the CG to test the theory that Open is full of rabid crazy greifer gankers; so i set off in my shieldless clipper and did 4 runs of reactive armor.
Nothing, zip, zilch, nada, nothing, no one interested.
I figured maybe they thought a Clipper wasn't worth the hassle, so i did the same thing, 4 more runs, in my shield less T7. Guess what....Same outcome.
Getting ganked in Open is a rarity, but the people who do fall victim are the ones that shout loudest.