Here is my personal subjective as well as objective view on this.
I was recently with my family at SFWOA, and my wife and I took advantage of the Fast Lane promotion.
We have 2 daughters who are too small to ride the larger coasters, so we took turns riding them as the other one rode with them on other rides, etc.
It worked for us very well.
We had no problem paying the extra $10 x 2 for 5 rides for each of us.
Life is run by capitalism and free markets. Things usually work themselves to a point of elasticity/give-and-take within boundaries.
Like it or not, money runs the above statement. A company in a free-market capitalistic society will gravitate toward making the optimal amounts of money while still staying in business, or fold.
We are also family season passholders at Paramount as well as Six Flags.
On the flip side of things. Do you believe the park really wants the season passholders who pick and choose their days to ride over and over again a ride or two, after having eaten a meal before entering the park, and not buying the "accessories/cross-marketed items" which are the gravy for the park?
People have a choice to go to community college vs. a state college vs. an Ivy League college. What determines that many times? Money.
People have a choice to buy a Hyundai, buy a Honda, buy a Lexus, buy a Benz. What often determines that? Money.
People can rent, they can buy in town, they can buy in the burbs, they can buy in a gated community? What often determines that? Money.
People can choose to buy a season pass and get literally the cost of pennies per hour of entertainment with many uses. People can choose to only go to a park once in a while, while maximizing their free time elsewhere.
Having visited way too many parks from pretty much everywhere, and ridden on unknown hundreds of coasters. We usually don't have a problem paying for things at parks, since the money is going to the parks. Sure corporations can and do different things with the money, but it is still going for the most part, in one fund or another within the park structure.
If this is not profitable for Six Flags they will not continue it. If it is, then they will not only keep it, but quite possibly tinker and fine-tune it for maximum dollars.
We have also enjoyed staying on property at Universal/Islands of Adventure for front line access, and other "supposed" us vs. them offers.
This is not about us vs. them. This is about the facts of life, and how a company will attempt to maximize their bottom-line.
If it upsets too many season passholders, that may or may not be taken into consideration. $$$$ talks, BS walks.
The uniqueness of a free society driven by capitalism should be cherised. It does not have to be revered and be considered the ultimate.
In some way or another, just about everybody institutes/has instituted $$$$ for service/better items/ease/etc. in their life, and that is because they choose to, and somebody/some entity has offered them that option.