South Pacific islands is one example (and J fares there can run in the thousands of dollars). I've never bought GE but have had several OWE tickets where I didn't use all the segments due to time constraints and it might have fit into the GE mileage limits. The original GE product didn't have a segment limit, only mileage, so it was excellent for lots of short legs (also prone to abuse by people using it for commuting!). Hence the rules were changed to prohibit such use, but no offset in benefit was added, making the fare rules not that different from OWE to compensate for the mileage limit.