Of course they try and resell you the dress. The point though is that you don't have to buy it. Dresses are a bit problematic because they flow, pretty much any other item - t-shirts, pants, swimsuits, underwear, etc you can use cross generation without re-buying it. Shoes are a problem, particularly heels, I've found even the ones made for the correct generation don't always work ;). DAZ will always give you the opportunity to spend money, you don't always have to take it ;)

And on top of autofit, I've got most of the Riversoft /sickleyield products that allow me to port a good 80% of my content library to the current generation from G3, G2, Genesis and V4.

My point though is not to be an ad for DAZ though, my point is that for content users Poser needs something - using an entirely different system if it wants, - that will allow close to the same end result.