[ThePurple73]

Sure everyone would like to see thier favorite sprint or silver crown driver at Indy.
The fact is this topic is much more complex and it it has a complexity that is very time oriented from a business stand point that some may not consider.
Say you are a product or marketing VP at a company that wants to provide and benefit from a major sponsorship of an indycar.
What type of driver do you want to provide for/investors/customers/your staff and work force meet and greets at business locations or the tracks?
Do you want a driver that has won a race/Indy500/Championship?
What will impress your clients? What will impress your intended customer base and what are the time lines to be not seen as a "loser". Every item or car that has your name on it you are outputting a marketing message whether winning or losing. The team and driver represent your brand.
How long do you have to become a winner and impress your investors or management team that this form of marketing is working? Or that the involvement in the team creates a positive customer and client result from watching or attending races, along with improving sales or creating brand awareness.

I am not saying you can't acheive this with Sprint/SC open wheel drivers, infact I know it is possible. Many of these business requirements are outside the technical car/driver side of the equation and comes heavily into play.

This holds true at all levels of racing but the more invested the more success is expected.