inexperience is why places liek that wont turn them. They dont trust the rotor so they arent willing to take the chance the rotor will fail and you get seriously injured. You cant blame them.

Here is why places wont cut slotted or drilled rotors. All brake rotors have a SPEC of how much they can be cut. Solid rotors will typically have a larger amount of matierial that can be cut away and still render the rotor useable and safe. Drilled and/or slotted typically have a smaller window of the amount you can remove. If you remove too much, the rotor can fail and you can be killed. Unless they know this spec they cant competantly cut the rotor.

So why do I cut rotors? Because I can and I use personal judgement with the amount that i remove. At times I have contacted the manufacturers for their specs on what the minimum thickness must be. If i dont know that min thickness I will cut to resurface but I draw the line at 10 thousanths. This will remove most average warp. A base resurface is usually 4 thousanths (can be as small as 2 thousanths) if the rotor is not warped. Another rule of thumb is you never cut so much that the slot is almost gone, kinda like tire wear.