Browsing content is self serve. Requires no professional time commitment of the partner.
Me calling you on the phone is going to potentially tie you up for 30 minutes or more and if I am good I will get you to provide some free answers. While you're on the phone with me you can't be doing anything else.
This presupposes you take more than just a stray call a month - which I am sure SWK is doing.
I've seen all sorts of people treat web inquiries as their constitutional right to free consulting/support. This form makes the process more effective for you since you have all the details first should you decide to pursue.
Heck it's shocking how many probably cannot even complete the form.