So for comparison Cedar Point did a similar event: several rides, including Steel Vengeance, open for guests plus one sample item of food from several new food locations. Except it was free.
A $75 "first rider" Steel Vengeance event was held that included unlimited free food, two free alcoholic drinks, and unlimited rides on Maverick and SV.
I'm ok with paid early access events for fans and enthusiasts, even at $300. My problem is that this is going into Disney's pockets, probably part of this land's budget was a $300,000 "grand opening tickets". The Steel Vengeance $75 per guest went to the LeBron James Foundation, the first rider benefit for Mystic Timbers went to the Andy Dalton Foundation. This goes to the "ESPN is Struggling" fund. Instead of getting some good will in a community angry at it, Disneyland instead decided to pocket the money.
Greedy ass hats.