Hello, I also got some troubles with attributes.
Most of them are working fine but i got a problem with this situation.

A banner costs
1 piece 100,-
5 piece 50,-
10 piece 25,-

Printed in 2 colors + 15%
Printed in 3 colors + 30%
Printed in 4 colors + 45%

Printed double sided + 50 %

-1 piece price in the article base.
-5 en 10 piece price i put in the product price manager
- I created the correct option names and values
- the attributs: 2 color: factor=1.15 offset=1 and so on.
The result is:
everything goes well with 1 piece.
The factor/offset is alway calculated from the base price.
That is not what i want, I want it calculated from the pricemanager prices eg

10 pieces 2 color:
10 * 25,- + 15% gives
250+ 15% from 1000 ( 10 * baseprice ) = 250+150=400

I would like:
10 * 25,- + 15% gives
250 + 15% from 250 = 250+37,50 =287,50

Is there a way to do this? I think i tried everything.
Help