U.S. Nationals rules state that if you go 5 for 5, you forfeit your last baton. At the international level (6 player teams) my assumption is that this happens less often that at U.S. Nationals.
However, our club has entertained the ideas of the "4 to start" variant for tournaments, but it never really stuck due to the fact that we had never seen 5 for 5. A few 5 for 6's, but never the perfect game.
Personally, I think the idea of "5 to start" is worth testing out, especially for 1v1 and 2v2 teams. As you may have read, our clubs stats are heavily weighed to the first thrower. While this may be the style of play, the low amount of players per team, or any other possible factors, it may be right for our club. Only more data will tell, which we continue to gather as the game becomes more accessible in the states.
Once I went 5 for 5 and had to forfeit a baton on a team of 2 when visiting a friend in Eau Claire...I'll never forget that match; 1 in probably 200+ matches I have played.