Why Capture Every Possible Lead From your Website?
Because if you aren’t capturing, profiling, logging and contacting the visitors to your site, mapping their behaviour and following up, then you are missing a swathe of potential leads, and any work you do sending people to your website in the first place (ads, SEO etc) will be kind of wasted.
Most people are unlikely to fill in a webform.
Take the opportunity to help people further, to address their queries and ultimately sell to them.
If they’re finding you in the first place, they are interested.