Its also worth noting that the Beach and SE/Ocean are not the same thing either. The decision making is therefore quite different for purchasers of the two variants. Arguably the former has more 'general utility' and the latter is more specialised. I suspect many Beach users have a slightly wider range of applications for the vehicle. Buying an Ocean, for example, with expectations of long periods on the road, lots of time sleeping and eating etc brings many challenges and tests the owners' tolerances and preferences to a much greater degree.
I may not be typical, but suspect there are many Beach owners like me who are thinking 'outdoor activities (place to warm up and keep dry, change, write/blog (in my case) etc), 7 seater flexibility, very occasional van, great for camping (with tent, workable without tent and great for crashing in if one needs to) and fab for days out, beach trips, touring etc'. I think an Ocean is more likely not to be the only vehicle and to therefore do what is precisely expected of it well enough to justify the considerable cost.