"What's in it for them....don't give a toss for ethnicity or religion...".

Being "loyal" to Israel is very profitable; lots of weapons and tech contracts to be handed out, lots of banking deals you can get commission on, lots of laundering to be done (Israelis pretty much run the worlds MDMA market and apparently some other fairly large chunks of various other drug markets). So they don't have to be zionist just greedy. There's also plenty of power, or access to it, to be distributed (having congressmen and senators in your pocket can come in handy for all kinds of things).

Having said that, on the face it seems like the classic anti-semitic trope but then, as you say, you find out that actually a lot of the heads of these companies ARE zionists and you have to ask if asking the question is actually not unreasonable.