Originally Posted by tlwyse 
For some like myself, handing off the printing of my digital photos to some unknown person would be like handing off my B&W film for processing and printing years ago...inconceivable.
While I appreciate the thought, you are comparing fish to bicycles.
If your system is calibrated, and the lab doing the printing is calibrated, and you are sending them files that have compatable profiles (sRGB is a safe bet) you should be in a wysiwyg situation.