It would depend also on how the operation was staffed on Stobart’s side. If they had people in specifically for handling scheduled flights I’m sure it would have been unsustainable without much greater volume. If they were multi-tasking across the wider HQ and other airfield activities perhaps it was OK.
I suspect an issue isn’t that the routes aren’t attractive, because actually BHD and DUB seemed to do reasonably well, but that there isn’t anyone suitable to operate them. Logan aren’t a substantial operator at either and doing a W from other bases looks tricky. If they had a base at BHD or DUB it may be a different story.