A 28:0 ratio is nothing to base a financial decision on.
FreeNetPass has great conversions. Their size is also an advantage, use their link list traffic to upsell sponsors in your members area. AVS traffic is the absolute best because they are paying customers that have proven they use credit cards on porn.
If you're looking for recurring revenue, try
PremiumNetPass 
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StellarCash.com - PNP affiliate program. Get PAID for your traffic, and get 100-200% back!