Sweepstakes casino revenues surged from $3.1 billion in 2022 to a projected $6.9 billion in 2025, growing at roughly 24% year-over-year (KPMG, 2025). That growth has turned sweepstakes into one of affiliate marketing's fastest-expanding verticals. But most affiliates still promote sweeps offers through push notifications or display ads, leaving the highest-converting channel untouched.