The_Bouncer

The only conceivable reasons I would pay a £100 premium for a Y flight with no status would be:

1. A significantly better schedule, helping me avoid an overnight airport stay before or after the flight (which would probably cost £100 anyway).

For example, a midday departure landing at 4pm local, as opposed to a 6am departure or 11pm arrival.

or

2. Avoiding a particularly uncomfortable aircraft configuration, such as a 9-across 787 or 10-across 777.

I believe BA has some of the few remaining 9-across 777s, so depending on the route this might be a factor.

Absent these factors, save yourself the ton.