Dartmoor is littered with granite, anyone clearing a site to put their new megalithic monument would have to move several hundred Merrivale size stones before beginning construction.
Coupla points. Is this really true? I don't know what sized megaliths we're talking about (my head is rather full of the ones featured on This is Spinal Tap
) but I wouldn't have thought Merrivale-sized ones would be very abundant. But more generally we had envisaged Merrivale as serving a wider area, just as Carnac does with an even wider one. But then there would be no reason to be in the centre of Dartmoor. I suppose you could argue that 'dressing' the stone would be a specialised function but this seems a bit lame. Cheaper to send the dressers.
Also the uprightness is a problem. Ooh, you are full of it. The showrom aspect would be served by having a single 'show-stone' so, yes, we need a good reason. Which I haven't got. Why don't you absent yourself a bit longer next time?