All I'm trying to say is that I have no idea how they have implemented it. If they are using the method you think they are using, it's not fair in the mathematical sense. Whether or not it is "morally" (not sure if that's the right term) fair is a totally different matter.
Most progressives eliminate this problem by either requiring a fixed bet size from all players, having one's chances of winning be proportional to their bet size, or having the same chance of winning but having the portion of the jackpot that is paid be proportional to their bet size. Examples include:
Fixed Bet Sizes
Jackpot Deuces
Jackpot Piņatas
Millionaire's Club
SupaJax
Proportional Chance of Winning
Mega Moolah
Rapid-Fire Jackpots at Cryptologic casinos
Proportional Amount of Jackpot Paid
Boss Media Jackpot Poker
MegaJacks
Super Jackpot (Cryptologic)
Whether or not it's mathematically fair is irrelevant, because both methods are still
random.
If your theory about the
RTG jackpots is true, then they don't fall into any of the above three categories, and the best way to win them would be to always bet 0.01 per spin and hope for the best. Given the amount of high-betting winners, I'm not sure that this is the case.
But can we agree to disagree? 
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