Yes, the ‘charge whatever you can get’ setup can be profitable on the surface, but it can cause large amounts of grief for the people who support the internal systems. I’ve spent some time at a company with recurring business; each customer had individually-set unit pricing and individual volume discount tiers. Wow, what a headache to manage – there would have been some significant value in a more open, universal pricing model with volume discounts that could’ve been stored on a one-page document instead of in a database.