The Seattle Sounders, whose majority owner is film executive Joe Roth, had to pay a $40m "franchise fee" to join MLS for the 2009 season.
The MLS also has a requirement that prospective franchises have a "soccer specific stadium" - which was waived in the case of Seattle - and Ottawa, for example, have vowed to spend $100m on a new stadium if they win a spot in the 2011 MLS.
On top of this outlay there would then be wage bill and running costs for prospective new franchise owners. Seattle's wage bill for the 2009 season is more than $3.3m (£2.4m).
The Sounders will become the 15th team in the MLS when they join the league this season, Philadelphia will join in 2010 and there are plans to add two more franchises in 2011.
Vancouver, Ottawa, Portland and St Louis are in the running for the 2011 places.
Beckham, who would probably enter a deal with his manager, Simon Fuller, would be unlikely to get involved with one of these bids.
Las Vegas and San Diego, who have long expressed an interest in joining MLS and are close to Beckham's LA base, would be more likely destinations.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.