- Edited
Here is a privilege system people might actually buy into.
You buy privileged, you get 5 chapters ahead reading access, but at the end of that month that 5 chapter advance access does not go away, you stay 5 chapters ahead (all it would take is 5 extra chapters each month to stop this from being an issue)
People that come in late would see the option to buy 5, 10, 15, etc chapters ahead depending on how many months those 5 chapters a month had been building up, but once they are actually caught up just the option to buy the extra 5 chapters a month would be there, but it would be a continual thing.
Of course you will have to jack the price up but I think people will feel better if only because they don't automatically lose the access to chapters they paid for just because they don't keep paying you, they only don't get access to the newer 5 priv chapters.
Sure the jerk aggregators would get a bit better situation from this but the people that mess with that stuff aren't going to buy priv from you anyway, and the ones that do buy will be much happier.