I realize this might trigger debate from both sides and it might also be more closely related to agencies where the providers likely see too many clients in a day but lately it seems I have had more instances of heavy lube use and diminished sensation.  
On one hand I feel badly if a provider is feeling pain, no one wants that.  On the other hand an ocean of lube plus condom can sometimes prolong the event more than necessary because of the lack of sensation.  Is it more painful to have to continue for much, much longer because you can't feel anything from all the lube or if there were less lube used and you can actually feel it or enjoy it more and finish more quickly?