I think the overall point is communications. Detailing a bid can drive out different apples vs. oranges issues (quality, quantity, materials, etc.).
I used to inquiry equipment fabrication and when we put the bid tabulations together, more often than not, we would get bids all over the board. You'd get one at $100K, another at $75K, the third at $72K and the fourth at $76K and the fifth at $50K. (Of course these were all vendors that were pre-qualified to do the work.) The high's and low's we'd go back and ask them to explain their bids (without telling them they were high or low). More often than not the low bid was missing something, and the high was just high but at times they included something extra that wasn't asked for, so when we found that, they could back it out of the bid and have an apples to apples bid. Knowing details of how the work was executed could also explain why the work was also less expensive for one than the other. One may have a process that the other didn't which gave them the speed, therefore lower price.
My bottom line is that it never hurts to ask about the other's costs and I always cross-check.
Ron,
How's the turkey coming along?
We're skipping tradition this year and going with roast pork (lots of garlic and marinade), black beans and yellow rice, along with collard greens (some soul) and pumpkin pie (some tradition).
Regards,