Shame on you! Your implied message is that printing is a commodity and can be provided by whomever comes up with the cheapest price.
I disagree.
I closed my small commercial printshop in September of last year but after 27 years in business I feel I speak from experience. A designer, no matter how talented or how much attention he or she pays to detail, is just as likely to make an error as anyone else.
This is when the printer you choose can really save your bacon. Rather than seek out the cheapest price, build a relationship with a shop known for craftsmanship. A good printer will gladly suggest ways to keep your project within budget...in some cases, ways that you never thought of. Paper selection, bindery operations, mailing efficiencies and a variety of variables can greatly affect the price of a job; trust your printer to work with you to make your mutual client happy...after all, you're in this together whether you like it or not.
And, as far as pitting one printer against another, would you like your client to seek proposals from several designers every time a job is contemplated?
It's all about trust and relationships, folks!

Dick Fowler
Newport, Oregon