There is 1st class demand up to Paddington during the morning peak and out again in the evening, there is very little in the opposite direction at the times..Your location would suggest you don't travel on FGW services very much. I do, four, five and sometimes six days a week. And outside the weekday peaks, there simply isn't the demand for first class travel on most services to justify current levels of provision. Even in the peaks, plenty of trains have empty seats in first.
Was standard class full to bursting?Today I watched an HST heading off to Hereford from my local station. There were all of two passengers occupying two first class coaches with almost 100 seats.
If not I fail to understand the relevance!
Nobody knows that, if the TOC can charge somebody who would normally travel standard to upgrade then that is extra money for zero extra outlay, IE all profit which the TOC will lose out on if the tickets are not available!It may be the case on some other services that there is sufficient demand to fill those coaches but from all the huffing and puffing elsewhere on this forum about the future availability of first advances on FGW, I suspect that if you were to limit the supply of those - which are already carefully quota-managed anyway - there would still be more than adequate capacity for people willing to pay the full whack for first class, even at the busiest times.