You seem to have confused a number of different issues,
Item - Football is part sport, part entertainment and very much a business.
Item - Brand Beckham is global, attracts worldwide interest counted in millions. Millions now know of LA Galaxy.
Item - Fair dues, perhaps you're another Anglophobe and that's your privilege. But if your 'America First' attitude prevailed, how would you feel if we banned 'works' by Tom Cruise et al ?
Item - Beckham's basic football wages are comparable to those of other top players. Add-ons reflect his marketability, which LA Galaxy fixed in order to attract him across the pond.
Item - His deal can't be linked to your inadequate healthcare provision - that's for the voters of the US of A to
decide, not the owners of a football club. As a Brit, Beckham would support our NHS system, which is regarded by many of your countrymen as an example of detested Socialism.
Item - As for being a 'retard', Becks is footballer not a College Professor. And he's not done too badly, has he ?
But you remind me of one your NFL players who was coming over to play Gridiron at Wembley - and a bit nervous about making his first trip abroad. But he was mightily relieved when he found out we speak English in London. (True story.)