Often times the rogaine scoring has 30-39= 30 pts each, 40-49 = 40 pts etc. Easier scoring...
This.
Also, it makes it far easier for competitors to calculate points for different loops on the fly. We moved to this system in the last few years (after 20+ years of groups of 6 being the same score...why 6? Presumably because that's how wide the punch card was...) and it's an absolute godsend for working out points rapidly.
We now use something similar to version 1, but with 10 to a row and 10 rows. The card ends up being quite wide, so you can only punch most controls from one side, but it works for us. One other thing to consider with larger cards is whether to leave a blank space in the middle - people tend to fold their cards up, so if you leave a margin at the obvious fold point then the fold won't obscure a punch mark.