[fjsolwmv]

You left out the #1 reason: so you can suss out their spending power and level of need so you can charge value-based pricing instead of cost-based pricing. Nothing you wrote is relevant to OP's concern about "call for price".

[davidivadavid]

Most SaaS that is intelligently priced is value-based, even if the price is public. What you mean is that you want to do price discrimination. That's possible but somewhat risky as people will ask for references, and references will sometimes disclose how much they pay, etc. So no, overall the OP has the main reasons right.