The argument of more compute power for this plan can be true, but this is also a pricing tactic known as the decoy effect or anchoring. Here's how it works: 1. A company introduces a high-priced option (the "decoy"), often not intended to be the best value for most customers. 2. This premium option makes the other plans seem like better deals in comparison, nudging customers toward the one the company actually wants…
So they charge (as I recall from what he told me I could be off) something like $450 for shipping the books (don't recall the actual amount but it seemed high at the time).
So the salesman is taught to start off the sales pitch with a set of encylopedia's costing at the time let's say $40,000 some 'gold plated version'.
The potential buyer laughs and then salesman then says 'plus $450 for shipping!!!'.
They then move on to the more reasonable versions costing let's say $1000 or whatever.
As a result of the first example of high priced the customer (in addition to the positioning you are talking about) the customer is setup to accept the shipping charge (which was relatively high).