I think it's not possible to rent video games in Japan, so the used market is of bigger importance. Games are bought, played through and sold back to a store within a week, so it is kinda like renting, albeit in a bit weird sense.

If a game sells out, more often than not new shipments only arrive when used copies are already plentiful, so games that were initially underestimated ultimately lose out on potential sales.

The exception to this rule are naturally those games that people hold on, therefore not enough used copies get into circulation to satisfy the demand which means that people have to buy new.

They seem to have stable 1 in 4 attach ratio

Very talkative monster by the way.

On the flipside, isn't it nice to know where the floor is?

That is correct. This is the main impetus behind putting DLC into games like Layton and DQ IX, with the DLC unlocking week by week.

The numbers are decent I would say, remember this is rebirth of franchise or the closest thing to a new IP. It also has supply issues from some statements, which will hurt it. 

It does need good legs to be considered excellent or good. However the numbers aren't bad by any means. 

Kinda what I was thinking as well. Somewhere in the middle.