I believe I mentioned on another message to you ... but just go to the Products Price Manager for this product.

Edit ...
Enter 0 on QTY
Update ...

For what you are trying to do, I would use Product Discount Quanties.

Set the products_price for the price of 1

Then Add Discount Quanties for the rest.

They can either be a Percentage or an Actual Price

Using the Attributes is not the best way nor the most efficient way to do this.

The Discount Quantities would work much better for you.

Now when the customer buys 4 they will get the right price.