scjohn,
Do your bids have an expiration on them? If you bid for a particular job, then IMHO providing less than what you bid to provide is essentially stealing.
But the other side of the coin is that copper prices have gone through the roof, and you bid this job _6 months_ ago, and your underlying costs have gone up quite a bit.
IMHO it is _not_ immoral to take a bid off the table after a period of time. Have you now signed a contract based upon the bid and are starting work, only to get sticker shock on the cost of the wire, or is the customer asking you to start the job now, and you think that things should be renegotiated because of the delay?
-Jon
