reading between the lines, I get the impression that:
The council contribute 10% of the cost of maintenance, in return for access to the bridge
Two people lived in the toll house, and in return for a peppercorn rent they collected the tolls through the summer months. this offset most of the maintenance cost
they went off sick and retired, the council hadn’t maintained the toll house very well, and it was going to cost thirty thousand to make it habitable again
the council decided this wasn’t worth it, so didn’t repair the house or replace them, this meant the maintenance cost was unfunded
the council suddenly got a shock when they realised the maintenance underfund was more than they had figured for (as it happens, more than the cost of repairing the toll house)
now they want to close the bridge to save money
So this basically amounts to mismanagement, short termism (not maintaining the toll house) allied with more short termism (not replacing the toll staff) and multiplied by even more short termism (the loss of tourist spend to the local economy)
Alternatively, you could see it as a classic parade of the bleeding stumps gambit – try and threaten the coastal route so the WG step in and cover the cost.