there may be some truth there but it's more about the bottom line which is profit...it is simply not competitive, so the consumer has to absorb the price
that is also why they got big...buying power
a retail store's expenses include: the rent which is per square foot with a kick back percentage of the profit to the mall, you have fancy racking, fancy shelving, you have to create a certain ambiance, the hydro, warehouse receivers, merchandisers, sales assistants, department managers, store managers, district managers, etc.
a retail warehouse...(buy your warehouses) then you need drivers, warehouse stockers, pickers and wrappers, a mailing department and management....
they have cut down on a ton of expenses, prices get somewhat passed on to the consumer enough to make the savings worth the hassle of waiting for arrivals