On the positive side, it might be better for the kid to get it over with if you are assuming chicken pox is inevitable. But, it isn't.
The problem is, all kids do not react the same. Some will get it more violently than others. Plus, they can have future episodes once exposed.In addition to this, the children interact with different adults who in turn will not react the same to the virus.
A chicken pox vaccine would be better and is covered by medicaid and insurance if it is prescribed by a doctor.