From firsthand experience...
The lockers have their pros and cons. On one hand, keeping people from leaving their stuff on the platform means less opportunities for stuff to get lost/stolen and leads to faster load times as people don't need to walk across to the other side to leave their stuff (cups, souvenirs, and buckets don't take up much room anyway so leaving those off to the side isn't an issue).
On the other hand, people hate paying extra for lockers. It makes them feel like the park is after their wallets. Admission, food, and merch is already pretty pricey to begin with.
A lot of parks don't charge for lockers or charge for lockers, but allow people to leave their things on the platform. I know the park had cubbies at the coasters for the longest time. I've also been told that people were stealing out of them, so the park got rid of them to keep the complaints down.
I'd honestly like to see the park adopt free lockers like Universal. After a set period of time (based on wait), you will be forced to pay for the lockers if you don't remove your stuff. That way you satisfy both parties by keeping the lockers free and providing an incentive for people to put their stuff up instead of having it lying all over the platform.