I was going to say waiting at other stations along the line might not be so nice. I was going to quote Hayle, but it doesn't stop in the up direction-why not? Often wondered this! And why not Par on a Sunday night? I get not Taunton, as this allows a Sunday night diversion, but Hayle and Par are both passed anyway, and both served in the other direction.
Hayle is curious anyway, a number of holiday parks there, and not all trains stop. when I was last there, the taxi drive took us to St Erth (as the train didn't stop at Hayle) and he said they have lots of business taking people to St Erth for the trains, so there is clearly a demand, but people have to taxi it at present! Obviously he wasn't complaining though, as good for his business.