It's in the name, WhatsApp for busy-ness. By forcing all your clients and potential clients to chat with you instead of just putting the information on a website for them to find, you will indeed stay busy all day with people asking the same questions over and over.
The layout of Facebook pages are controlled by Facebook and not very good for businesses or their potential clients, since it puts emphasis on social media updates. What I'm talking about is a real website that shows up on a Google search, where clients can purchase/order the product and easily find the information they are looking for. It costs business owners a pittance to hire somebody to make it.
But some of them think it's better to not give any info and force potential customers to call or chat with them, believing that they are such great salesman that they have to get in there. In reality they are like the bazaar salesman who didn't have prices on their products and got completely crushed by super markets, which are organized and price transparent.