To at attract people they should increase payrate to least $100 for Hero/legend then they will see what would happen, although this is not a gateway to becoming successful over here but a long term approach matters a lot as most casinos has been running their promotions for over 7 years here, they result can’t be comparable to them because they released money for their promotion.
Management on their signature campaign, participant selection, and post quality check for payment eligibility are more important than the pay rate. If management is bad, incapable to select good posters, and strictly refuse bad posts from accepted participants for payments, with whatever pay rates, you will receive many spam posts and pay for such posts with less effects for your company.
Not all posters can maintain their post quality without a strict management and requirements from signature campaign managers. They can start a campaign with good posts but if management is soft, they will spam later.