IMO, they are just supplying what people seem to respond to. For instance, monsters and tunas are world favorites. That's why you see so many variations. They are capitalizing on the less prone to go south models and accumulate dust on warehouse shelves. There are very innovative models butt ugly outhere, if you ask me. About a month ago there were pics of a new Singapore diver's model that almost made me puke.
So to me it's better they keep on betting on the sure shots instead of far-from-seiko-tradition models that are as ugly as the day is long.
They missed the boat not relaunching the 6309-704x, opening up the venue to independent enterpreneurs (sp?) like Noah and Jake with the Tsunami. The same can be said over SKX models. More people buying mods over the stock configurations.
And if you ask me, I'd rather see nice tuna variations all the way instead of new diver's that are disgusting and have a horrible design. Having said that, the tuna design have to be applied in a diver's approach. You don't turn a tuna into a land trekking watch. So I didn't like to see the tuna concept being addapted to a watch that is NOT designed to be a pro diver. That would be the same as addapt a Landmaster case into a 500m pro diver's model with a ceramic bezel but the same crown originally designed to seal a 20 BAR watch only now "sealing" a 500 pro diver's resistance without any additional reinforcement in its structure.