I looked into the plastic recycling/reprocessing business for a while and determined that once we pick up all the plastic that litters the streets, roadsides, beaches, etc. there would not be enough used plastic available to support such a business. There just aren't enough people in Belize to sustain the used plastic input necessary to keep such an operation viable even if the plastic was simply washed, chopped, and shipped somewhere.
A deposit on plastic could be used to collect and ship the plastic to other countries but probably wouldn't be self-supporting either.