A lot of people love the draft, but unless you're Matt Millen, there's actual work that needs to be done. Things like scouting, building a draft board, et al. That and having to hire a GM, along with a pro personnel and amateur scouting director. Then, supervising them to ensure their vision mirrors yours.
It's not like a guy can show up a week before the draft because he had success 15 years ago and draft well.