If a 49 seater is not viable with lower prices does it make sense to operate from an additional point, say Leeds - EMA then FRA
I see where you are coming from, but from a business perspective this would be totally unviable. This would add thousands of pounds extra in costs despite there being a potential in more paying PAX to cover it.
There's honestly hundreds of reasons how these costs mount up on a double sector flight... even W-pattern flights add complexity into scheduling meaning more costs.