I think potential buyers will need to do PLENTY of research beforehand to discover (for example) that they can travel direct from Manchester Victoria to Warrington Bank Quay (Northern) but not from Manchester Oxford Road direct to Warrington Bank Quay (TfW).Of course you can have a jolly good day out for less - just as someone from Brighton can have a jolly good day out in Chichester for a lot less than the price of a Southern Day Save Ticket or someone staying in Ashford can have three day trips for a lot less than the Kent Rover. This brings a lot of places further afield within that range without the need to do vast quantities of ticket price research and with the ability to react on the day without being committed to stay at Ribblehead (for example) for the next 5 hours despite the fact that it's chucking it down with rain and your waterproof has sprung a leak. Each to his / her own, however - and if people's idea of a good day out isn't covered by this ticket they don't have to buy it.
Any flexibilty gains that you get from not being tied to particular trains you lose by being limited to a certain TOC, in an area where multiple TOC operations are not uncommon.