I'm wondering if your hidden categories will help solve the management of prices?

I have downloadable products that are currently priced solely by attribute (priced by size).

I'd like to create four bands of price attributes (cheap --> expensive) and categories seem to be the best way of achieving this because I can copy the price of 1 product (I can create a reference product that is used soley for this purpose; in fact 4 reference products, one in each category) to all other products in that category.

I don't particualarly want the customer to be aware of the category only that some products are more expensive than others, so hiding the category (but not the product) seems a good idea. Currently all products reside within 1 category "stock photos" - not a problem at the moment because stock photos are all that is sold and all are downloadable. If I start supplying framed photos, for example, they would reside in a completely new category where price banding would not apply.

Any thoughts / downfalls about using hidden categories for price banding?

Thanks,
Ric