Here's the deal. Hand nailing is good marketing! Find something to set yourself apart. I used to make a huge deal about hand nailing in my sales presentations. I know it mattered, because the whole point was: quality quality quality. They didn't care that I was hand nailing or gun nailing. INfact they probably forgot after I left their presence. The point was I was making a huge deal about how we care and how we go the extra mile.Some people will ask about it, but I ask them if there something about using a gun that they don't like and explain that a good roofer can use either method and be as good or bad as anyone else.
But to answer the question only a couple times a season.