@yukko i agree Picking strawberries is not easy. But i think They just taste better if you put an effort harvesting them. About the price. For me it's ok if they double the price.
Just look at it this way: maybe the additional fee is for the “experience” itself and not the actual products. After all, it’s not every day that we see strawberry plants. so experiences like this are more of refreshing opportunities than a hassle. It’s a perfect activity for kids too.