Machine work

I called various machine shops to get my 340 bored and the most common responses I got were "not interested" or "if it was an LS I would do it". Does the boring machine care what block it is? Is the economy so good they can pick and choose? Anyone else had this issue but it doesn't have to be specific to machining. I finally got the block bored, etc but this blew me away.
I was blown away by the best machine shop in the area , telling me that they couldn`t check cyl wall thickness when I had my 440 block done .