Are staff at ticket offices at GWR paid commission based on sales they make?
I have never seen such aggressive upselling.
Firstly, I have had a few instances where staff try to convince me that tickets cost substantially more than they do, then get abusive when they're caught out and I buy one from a machine at the correct price instead.
I often split tickets to save money and staff at GWR spend over a minute trying to convince me to not do this, even to such extremes as the ticket costing £45 when split and £90 when it isn't, as the more expensive ticket offers greater flexibility and it's 'definitely worth paying twice as much to arrive ten minutes earlier'.
A month back they lied to my wife that it would be cheaper to buy two singles than a period return and unfortunately she believed them.
Today I have had a woman trying to convince me that I should buy a period return, rather than a day return, as this offers greater flexibility should I change my mind and decide to stay overnight at the last minute. As usual, she didn't just drop this when I politely declined and went on for over a minute attempting to convince me to spend more money.
I haven't experienced this with any other rail company and the only explanation I can think of for such aggressive upselling is that these guys are being paid commission.