We do have a Track that tried several things at once with huge starter fees and huge purses and that would be Monmouth 2010.
Using Monmouth as an example is a little tricky because it is a B Track. I know I played some races there in 2010 because of field size and I believe they had a low takeout P5 that was all the rage.
The author of the article in the next post is comparing Monmouth 2010 to Belmont. You can't really compare an A Track to a B Track in my opinion because New York and California have a large group of loyal followers for the most part.
The Monmouth Experiment was NOT a success in my opinion because purses and starter fees were too high and I believe they ended up with huge increases in handle and field size but they spent more than they took in.
It all goes to optimal pricing and finding the right spot for any given track. Finding the right number for purses, field size, takeout, starter fees if any, is essential to success. The only way to find the optimal price is to play with the numbers until you do.