Successful salespeople don't pressure or bullshit the
  prospect into a sale. They are persistent, but they are
  always focused on achieving a deal where it will benefit
  all parties.

I couldn't agree more. I ranked first in sales at my company for a quarter, before they promoted me. While some of my peers used scare tactics, intimidation and downright lying to close the deal, I was always prepared to walk away from deals. I never suggested anything that wasn't in their best interest because I was thinking long-term. Funny how customers see this genuinity and come back after shopping around. Referrals were often the result, while my peers had customers with buyers regret. They hit their quota by the end of the day, but lost in the long-term. On a side note, your title may be a little misleading. It should say "Sales come out of genuinity" as the current title implies that knowing how to sell is something inherent, whereas it's something I taught myself.