It's not as stupid as it sounds.
On the Not London route, the reveue will go principally to CrossCountry, with East Coast and Virgin taking a marginal share on that flow (Virgin from BHM to Scotland, or East Coast from Doncaster/Peterborough - Scotland) but the likelyhood of someone using either of those operators is marginal, and thus their revenue allocation will be very small.
I would very much doubt it would principally go to XC, as the most sensible route would seem to me to take the more direct route via Carlisle, this is also faster usually. A lot of TOCs would get money from this ticket, and I hope none of them would moan at carrying a passenger who happens to choose their route. I bet Northern don't get much but, without checking, I'm sure the ticket is valid via Appleby!
On the +Any Permitted fare, the reveue share will principally be weighted between East Coast and Virigin, with a leaning to East Coast as they will provide the most direct oppotrunity to travel KGX-INV and change for Kyle.
Less changes does appear to increase the weighting but I think that the effect of one train (the Chieftain) may be exaggerated a bit. It's a once per day train, albeit a popular one that does indeed have a lot of reservations for the throughout journey.
The excess, whilst not costing you anything, will reallocate within LENNON the reveue from XC to EC for the return portion that is excessed.
That's an incredibly simplistic analysis. In
theory, it should completely re-allocate it. It would still be valid on XC either way, I admit XC would get less revenue but in both cases I think Virgin would get a fair chunk.
So doing it without the excess East Coast dont have to carry you, as they are not being paid to...in effect.
ARGH! Not that argument! If an EC conductor wants to get the revenue re-allocated (and I've not actually had it confirmed that the revenue would get re-allocated but, for the purpose of this discussion, let's assume that ATOC are competent in this area!) then they simply have to issue a zero excess, the talk of "not having to carry" is crazy talk - just issue a zero excess and be done with it.
As for the "they don't have to carry you if they are not paid to" argument, it's completely made-up! Validity is NOT determined by revenue allocation. Revenue allocation does NOT determine validity.
If someone has a Huntingdon-London season, EC will get next to nothing for that ticket given that it is probably never quicker to change at Stevenage onto one of the infrequent EC trains that actually calls there, and if it is, very rarely, and direct trains carry a lot of weight, as you correctly identified earlier anyway. EC certainly would get a lot less of a proportion of that ticket, than they would for a High Wycombe - Kyle Not London, I bet! Anyway, someone with that season ticket may go from work straight to an evening out in Peterborough. They get a Huntingdon-Peterborough CDR. EC gets no revenue from that. That person is perfectly valid to get a non-stop EC train. That is valid. EC cannot (and I am not suggesting they would - this is purely an example) use the argument about not getting money and therefore refuse to carry the customer. The customer is valid - end of!
The argument that "we don't get enough money from the revenue allocation of this ticket, so we don't have to carry you" holds no water, and is totally and utterly meaningless.
I hope that settles it
Anyway, as I said before, the OP should try to get a zero excess as early as possible, because
some staff
a) don't know how to issue excesses correctly and may try to overcharge; or
b) don't want the hassle of issuing excesses and may try to overcharge; or
c) insert random non-reason here...(I've heard so many I get tired of hearing them!)
--- old post above --- --- new post below ---
Here are the most recent times I've quoted it (apart from today):
http://www.railforums.co.uk/showthread.php?p=491677&highlight=huntingdon#post491677
http://www.railforums.co.uk/showthread.php?p=485114&highlight=huntingdon#post485114
http://www.railforums.co.uk/showthread.php?p=461741&highlight=huntingdon#post461741
http://www.railforums.co.uk/showthread.php?p=415065&highlight=huntingdon#post415065
Sorry I keep re-posting it (5 times in 6 months

), and
any stations could be chosen! (e.g. Micklefield to York season + Micklefield - Leeds CDR on Cross Country. XC won't get a penny - tough!) because a combination of
any non-PTE issued
season +
any point to point walk on ticket(s) are valid on non-stop trains provided by any operator, irrespective of calling patterns on the non-stop trains. The train does not need to call, it just needs to pass through the station where you change from one ticket to the other.