Well, I don't know if it would raise the price CONSIDERABLY. I mean if they were going to do ALL of the holes, mybe it would raise the price $15 or $20. If they ONLY did the holes where a big load was going to be placed (like the Altitude bearing), it would only add a few cents.

Remember, they have to drill and thread the hole already.. To drill it a little larger and thread it with a little larger thread would cost almost nothing additional. Then to run in a Helicoil insert would cost them $2.00 plus labor (and let me tell you, labor in China is appallingly cheap).