I think having 1000 notes is a bix extreme and they must be a big target for counterfeiters but I can't imagine many places accept them. In my country most shops wont accept 50 notes because of the chance of them being counterfeit. In fact it is very rare to see them at all and I have only ever see a couple in my lifetime. Trying to ban them just because criminals use them is sill though but maybe we should ban banks too since they're the biggest criminals.