kcollins...... that's all well and good and quite true to some extent, but why on earth would you show your customers what you pay for everything ?? Or better yet, why would you be happy to show them your costs ?? Does that prove anything ??
Most customers of signs are the same people who buy most any other products as well. DO they need to see what you paid for electricity last month and how much went towards their sign(s) ?? Do they need to know what your UPS shipment cost ?? Do they need t know what you paid for toilet paper ?? Many many years ago, one of my sayings to customers was.... well, I don't have the high overhead they have, I don't have 2 bucket trucks and 3 cranes to keep busy and pay for their upkeep, I don't have 38 people on payroll and I don't have the waste they have, so when they quote a job like this one, all that goes into your $1,800 job. Without all that same overhead, mine is much less, thus the reason I can sell it to you for a better cost. However, I never showed them each and every cost you are talking about, let alone saying you're happy to do so.
Granted, you have no machinery, overhead, employees or most of the items going into your quote/sales, but why show them your price lists ??
Other than trying to look like a nice guy at others expense, I see no reason to show all of your costs to your end-users.