I agree with your post almost entirely, but just couldn't help pointing out that the Northern service is actually quicker
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(Image shows services Liverpool Lime Street to Manchester Piccadilly, NT 45mins, TP 47mins, EM 49 mins)
I was mostly on about the CLC splutterbugs rather than the 319s that sail the Chat Moss but I'll take your point.
Gray1404 - giving the option of a 'boot en route' to wait for their booked train is generally what I do but I only work via the CLC route so if they've got a Chat Moss advance or they've gone to a point in the train that I don't get to until later on in the journey (if it's busier than normal I'll usually reach the last coach I check - not always the front, I hop around - after Warrington on the up) then I charge them regardless.
It's like split ticketers - I do appreciate them getting a good deal and I'll help them to get their tickets as they request but I also expect them therefore to get it right - so when it says on the new type of ticket 'valid on the below services only' with time, train, etc, they've paid 3 quid and it's the middle of rush hour, they'll be paying again sadly!