I'm not exactly sure an over the phone quote is going to get you all the info that you are going to need. You might get an average quote and if your lucky, you might get an average quote for good, better, best, but even then, you may or may not get material numbers etc to let you know exactly what they are using for those quotes. In my experience, to get that info, it's usually a written quote with all that info written down and there is an appearance that your more serious about the project then just the initial phone call asking for a quote.
Now, the big stick in the mud is assuming that they know their numbers as well. I've seen people quote cheap on really good materials. They don't want to lose the job, they assume that having the machine running period is better then not having it running at all. Or are they able to quote cheaper because they are more efficient or have better purchasing power, both or something else?
Knowing the price of everyone is good to know, but it only goes so far.
If it's price, price, price and nothing but price, price, price, then you are definitely placating to a commodity market and those customers will only be happy as long as their pocketbook is happy. Regardless of anything else. That's a market run on the thinnest of margins with the highest degree of efficiency.
And a lot of people still question it. It's as if they want to make sure there is an up and up reason for why the price hike. Even on here. So while most people may understand it, they still want to make sure nothing slimy is going on in the background and the price hike is on the up and up.