"The bitterness of poor quality remains long after the sweetness of low price is forgotten."
In life, and in business, you do not get something for nothing.
Remember that when that next offer comes in and seems to good to be true. If you can not justify the numbers, then you should start asking questions. I see numbers for projects all the time and I have to stop and ask myself, "Do they really understand the scope of work, or are they just going to skip over half of the work if awarded the contract?"
As a client, you should ask yourself if you want the Walmart experience or, the Nordstrom experience.
Just a thought!