Zorkesh, wielder of Toras's page

I can't speak to the magus but I enjoyed ALL levels of my likely EK. I'm playing a CRB-only PFS character, half-orc Ftr 2 / Wiz 5 at the moment and he's fun as heck. Next level will be my first EK. Yes I have two fighter levels, I enjoyed hacking and slashing at lower levels. I now throw my spellstoring cold-iron greataxe charged with hideous laughter and arcane strike up and have a heck of a time. Gaseous form if I get in a pinch works wonders and of course so does a well placed lightning bolt. I've grappled casters and sucked the strength dry from bigger mooks at range. With mithral full-plate, amulet of nat armor and a shield buff up I'm sitting on pretty hefty AC, and my hp is decent as I've usually siphoned some delicious health with a touch attack that's hard to miss (long lasting false life adds to the mix for good measure). At 5% arcane spell failure, it's a fun gamble and the odd time I fail, well hey man that's flavor. Mmmmmmmmmm Delicious flavor.

Can someone verify this for me? Don't know why but I feel quite confused.

To enchant my MW Cold Iron weapon to a +1, it will cost me 4000gp.

To then enchant that weapon with a special ability with a +1 item cost, will cost 2000gp.

With a Fame of 26 and each enhancement being treated separately, this is legit?

Thanks!

EDIT: My bad, I see now, the cost to add would be as if the effective enhancement addition was +2. So... 6000 GP to add the ability to the +1 weap?

Flagging your post for FAQ Jiggy. I'm currently playing a Ftr 2 / Wiz 2 with an arcane bonded greataxe, it would be phenomenal if I could save on upgrade costs as I already shelled out to bond with a MW cold-iron version.