What is the purpose of a warm call?

I usually connect with clients via email, and those who show interest will respond. After receiving a reply, I’m unsure of my next steps. Typically, I call them to discuss the position in more detail and then go over my fees. I’ve learned from online resources and conversations with others that it’s important to identify their pain points and explain how I can address those issues. However, I’ve noticed that even when clients express interest, they often don’t follow through, making it extremely challenging to get them to sign the contract.

I understand that this is a numbers game, but it baffles me why someone would agree to a phone conversation with a recruiter, say they work with agencies, express the need for assistance, and even indicate comfort with the fees, yet still decline to sign the contract when it’s sent over.

I feel like I might be missing something in this process. I would greatly appreciate any insights or advice on how to improve this situation.