i see gambling advertisements everywhere on the tour and was thinking this for a while. It's definitely not going anywhere as it really seems some tournys are struggling for endorsements. Not paying 100k appearance fees to certain players would be a good start in cutting costs.
The crowds normally come, name or no name, if the venue is right. Look at WTA Stanford, one of the worst premier draws in recent memory and the stadium still packs itself in qf's and up.