It saves you money.
It doesn't save the contractor time or money, and they're often just out to get the check at the most profitable possible means.
There are some good contractors, no insult intended to the good ones on this forum.
All materials, time, and quality workmanship are nowadays viewed by most businesses (including contractors) as "expenses" that are sucking money out of potential profits.
This is because the general precedent is that they're 'off the hook' without an expensive and long lawsuit that may end in their favor anyway.
So there's no solid incentive for them to do good work, since so many do not do good work.
It's not like one company that does bad work gets put out of business.
When the greater majority of companies ALL take shortcuts, there's enough work out there for them all to succeed at cutting corners without getting punished for it.
The entire theory of the free market correcting itself collapses on it's face when most of an entire industry tends to slide down to a lower quality standard, or all charge large fees; the consumer has no recourse then, because the few companies that do better work are booked out months or years ahead, and people are forced to go with the lower quality company who (allegedly) can start the work on schedule
The alleged "free market" doesn't punish them appropriately and cull the bad businesses out of the market when it's the majority of businesses that are operating in a way that most consumers wish they wouldn't.
There is a very mistaken belief that only a tiny percentage of businesses
are immoral and unethical in how they work for customers. I think that's as true for contractors as it is for the healthcare industry, the finance industry, or anywhere else.
We need to find ways to make these people more accountable down the road for their actions.
Allowing people or businesses to be 'off the hook' after just a few months or a year or so simply encourages short sighted thinking, the performance of work that 'will be good enough to last until we're not responsible'.
Of course, every business out there will tell you that they don't do that, that their reputation lies on their work and whatever other blather and BS they need to say to try to convince you to sign that contract, sign it now.
But with things like the short term memory the public has, combined with a growing precedent of companies being allowed to sue customers for talking about their experience
http://abcnews.go.com/Business/couple-fined-3500-writing-negative-review/story?id=21018224
.. we are not in a good environment for companies to become more and more quality focussed.
We're heading the other way fast...