As several others have pointed out, you are pricing the "luck bonus" wrong.
Firstly, it's 2,000 * bonus squared, not 1500 * bonus squared.
Secondly, because the "luck bonus effect" does not take up an item slot, you have to double its cost.
So a rock or a stick that gives +3 luck bonus to saves costs (2 * 2k * 3*3 =) 36,000 gold.
+ 21,014 gold for the +3 Adamantium Hammer equals a market price of 57,014 gold.
That's assuming your GM even allows you to do this - remember the very first thing that the custom item creation rules say: All magic items require GM approval.
Personally, as someone who used to be a BIG min-max power gamer in the 3.0 days, I would turn down this item as soon as you suggested it to me. I've seen what happens when you open the door to allowing "alternative bonuses" on custom magic items, and it's ugly.
Now, if you had it grant a +3 resistance bonus (total market price: 39,014 gold), I'd be okay with that.