I run an opt-in mailing list and send out something like 70+ PC's and laptops. As you'd expect there's a brief run down of CPU, Memory etc. So some bright spark sent me and email asking "Can you supply the generations of the CPU's and the CLOCK speeds of all the memory on every unit please."
I quoted (Actually I under-priced it tbh) to replace a screen on a laptop, inadvertently I was not making any money on the actual screen but at least was making money on the installation. Had an email. "Do you have a courier service? If I send it to you it will cost money and I would expect a discount on the price you quoted."