Would be nice if they offered them at most shops. I guess they want people bringing the Aldi bags from home? If I go to a grocery store to buy stuff then I can plan and bring my own bags but when I leave my house to go to Busch Gardens the last thing I am thinking is "oh let me get a shopping bag in case I happen to see something I want today". They are not so worried about the enviroment when they are lining the trash cans with 55 gallon plastic liners? Or how about all those ponchos that go in the trash at the end of a day at the park.
I think part of it is that you might buy one bag but you won't get a bag at every single shop you go to. Instead you will just put stuff in the same bag.
Someone might need to check if this is still true but when I worked there SEAS was paying extra to have all trash sorted for recyclables at BGW at least.