By no means is it a guarantee that a guy will sign with you if you give him a scholarship offer and a promised start (it's possible though). With my A prestige D3 team, I've found that 2 home visits and a scholly is almost always enough to get a recruit to consider and sign with you. That said, I'm not sure the amount of phone calls/letters it would take, but I know that around 10-15 scouting visits will usually be enough to pull down a player. Not cost effective, I know.