What is critical is that your business sales and marketing leadership must generate excitement, spontaneous enthusiasm, buzz and traffic. Selling is a process. Sales people, in general and as a whole, are independent and do not respond well to tracking their funnel-unless the process or system helps them close more deals.
Absolutely people buy from people. Absolutely the value you add to the product or service you offer as a sales professional is critical - but your superior performance is often offset by your under-performing colleague.
Selling, as it impacts your business, is a science.

So at the individual level, selling is an art.
It is an art not everyone can success at when compared to other more suitable occupations. At the business leadership level, selling is creating the maximum opportunities for your sales force and training them on how to properly represent your product or service this aspect of selling is a science.
I am not that good of a sales person. But I have always been in the top 10% of whatever I chose to represent in a sales capacity I've trained trained hundreds, one at a time, who are better sales people than I am. But 90% of those I ended up outperforming - because I out worked them, put myself in front of more qualified opportunities day in and day out, and matched my charisma with my scientific approach.