What I understood with signature campaign is the pay per post, at least that's the norms here.
I not saw better then 30% of House Edge in Dice and 0.3% of bets in Roulette and Slots.
Most sites pay only 10% of House Edge in Dice and 0.1% of bets in other games.
Affiliate income is side income. Most campaigns here pay per post rates. If you do not, then you will probably not attract any posters, let alone good posters.
Plus, being your affiliate would mean advertisers are directly sharing your income, hence liable for any shady shit that you may pull off.
Being hired for advertisement at pay-per-post level, would not make them liable for anything you do (or don't).
So if you have the cash, then hire someone (not me necessarily) to manage the campaign for you.
Good luck
Thank you for your advice