Honestly, I have no issue with a split game if the individual parts are really worth it. If it feels like having a third or even just a half of a full game in each package that has been arbitrarily split up then I'd be extremely disappointed.
That said, I think there should be more scaling on price of games in general. £50 for a new special edition, £40 for a new standard game, £25 for an expansion, £10-20 for an indie or small game... just doesn't seem to cover the options, really. What if my game really is a bit bigger? Or better? Or I admit that it's really smaller and only worth £30...?
Perhaps I just don't understand how/why pricing structures are formed.