This is a key insight for many businesses that rely on leads with a very high customer acquisition cost. It’s spawned a whole industry of landing pages so that you can focus more on the needs/specific sector of clients. Instapage is a good example of this.
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It never ceases to amaze me the number of law firms in particular that have a website purely to boost their own ego. Yes, you should have a main site for that, but you also need to integrate this lead generation technology on your main site, above the fold, or better yet, have many targeted landing pages, optimized for both desktop and mobile, each running A/B testing to see what potential clients actually gravitate toward.