WSOP blind structure is only marginally better.

[Steve Brecher]

[ QUOTE ]
I think the primary reason for going to $20k starting chips was to discourage "chip substitution" from prelim events, rather than seeking an improvement in the $10k event structure.

[/ QUOTE ]
I've seen a report that a unique chipset will be used for the main event this year. So then the only reason would be to have a uniform chips/$ ratio for all the events.