For the benefit of a moderate number of cheap off peak local journeys that won't even cover the cost of running the train (if they pay, I don't do revenue on trains full of drunks unless I have security with me - there's another cost to factor in - gateline staff in most places have generally cleared off well before the end of service anyway so there's no revenue protection)?
The other point, which is repeated and then ignored as if it's only a minor irritation, is that in actual fact, it's not so be it, we don't have to, and aren't going to, work these shifts, so be it
I honestly do not care about servicing the needs of several distinct groups of passengers (I won't say customers, as it's by no means certain that they will pay).
1) Drunk sports fans (I won't say football fans as I'll be accused of sport racism)
2) Drunk clubbing types, particularly at 6am when no one wants to hear their rubbish, although anytime after about 1900 on a Saturday night seems to be no man's land
3) Cyclists
4) Thugs, yobs and other general criminal types who think they own the place and cause trouble. Particularly when drunk
As the main beneficiaries of these services are likely to fall into at least one of these categories, the chances of my agreeing to vary my contract to cater for them are slim to non-existent.
So to sum up -
It won't pay for itself without subsidy, it's obviously not a franchise requirement, so the train companies won't want to cover the cost
Generally the people who are required to make it happen, IE the staff, seem to have no interest in doing so
If you advertise it and it can't happen for whatever reason, NR adjusting a retaining wall or replanting a shrubbery, it then becomes an organisational nightmare to provide replacement transport
Please continue to debate if you will, but I can't see the point where the pros are going to so heavily overweigh the cons as to make it worthwhile. If you give me £1000, I may consider being the guard on a scheduled train arriving into a station on Christmas Day morning. However then you certainly won't make any money, particularly as market forces mean Mr Driver will probably pick up £2000 (and the RMT will chuck it's toys out, and so the whole thing will be cancelled anyway).