Hey there amigo!
As I noted to Beefy, the differences are cost and quality.
At $34.50 delivered to your door from Drivethru, you would get the same book, with the only difference being it would not have 'shiny' pages (nor a tail ribbon). However, you buying the book from them will net me a few dollars.
If I get the books printed from Mixam and post them to the USA at absolute best we are talking $54.50 for me to break even - it may even be a few dollars more than that, I think I eyeballed it at $56. So that is more cost for you and no profit to me - not that I was doing this for profit. But it seems a no brainer for me to have the books at Drivethru for $30 (+$4.50 shipping), if something saves you guys $20+ and makes me $5 in the process that's better than costing you +$20 and making me zero profit.
Now that said, if we get to see the quality and its massively different, that will certainly impact whether I allow future Printed options on Drivethru. But we will have to wait and see on that.
So I am still happy to post books to the USA if someone
really does want a signed, shiny pages version with a tail ribbon (I guess it would be a collector's item of sorts). But just be aware it is both more costly to you and less beneficial to me.