I think it's excusable for a relatively niche B2B service where there's likely a huge variation in the size of their customers. Price discrimination is hard.

If you publish any kind of price, that affects your negotiation options if you want to do individual pricing/haggling for each customer.

Also, a multitude of factors affect the 'true' price including various risk estimates of your company, and it would be counterproductive to say "factor X, as measured by Y, gives you a price increase/decrease of Z", as that would just result in gaming the measurement and misleading about the nature of your business.