Wish I had read the label?

It's a lot of ingredients, but most of them are spices or plant powders. The potassium chloride is probably there to reduce the salt content, yeast extract is a flavour enhancer and the gums help to thicken the sauce. Five types of sugar seems like overkill, and I don't think I've ever put sugar in a marinade before. The primary ingredient in most marinades is usually oil, which is more expensive than sugar, followed by acid (vinegar/lemon juice) and aromatics.