I would guess that the cost of Indy in relation to the other IRL series races is in proportion to running Le Mans versus say an ALMS race.
I don't know anything about the purse awards for Le Mans, but the amount of media exposure would outweigh by far what you would achieve in ALMS. Like Indy versus another IRL race.
Indy is the cornestone of the IRL calendar, and any ambitious sports car series needs to involve Le Mans as a hub, in my opinion.
If you don't, you are a regional or national series, and you probably aren't garnering enough media attention to gain the important investment of sponsors.
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