Have the flywheel and pressure plate survived?
Hard to say, for £300 it’s not worth chancing it and fooking up another plate and 2 days of work
A stuffed pressure plate is easy enough to spot. If it's not grooved or blued its good to go.
Still doesn't answer why your particular bike seems to get through clutches, unless the previous owner doesn't have any mechanical sympathy and 'rides the clutch' everywhere ?
In that case it’s fooked! There’s a couple of decent grooves in both the flywheel and the cage and a loverly blue tinge . £300 piece of mind for 6 million miles of clutch life
All the friction plates i've seen in that condition when changing a clutch have been caused by a lack of finesse and mechanical sympathy.