What he actually means is Posh decided she would try rescue her flagging career by living in LA, so henpecked David transferred to try keep her happy
I think it's for David's benefit as much as for Victoria's.
No top European clubs really wanted him, he didn't really want to play for a lesser Premiership club or maybe any other Prem club apart from Man U.
It's an oppurtunity for him to make even more astronomical amounts of money, but I believe he is sincere in trying to help launch soccer in the US ( although why he should succeed when the likes of Pele and George Best failed is lost on me, when he is not even half the player they were). Sad that so many - not you Tigress - have confused celebrity with ability, but hey if a good looking chap is what it takes to kick-start soccer in the US so be it.....
He has also one eye on his post football career - Hollywood/LA and Posh n Becks are well suited ( welcome to each other in my opinion ). Obviously he will continue to have a successful celebrity career for many years be that in modelling, acting or just being seen at the right parties with the right people.
That his US soccer school is so close to LA Galaxy is also a factor here.
I agree though that the talentless Victoria only clings to fame by association with David these days. I'm not a fan of her either - did you ever see those 'Bored of the Beckham's' tees a few years ago?