I am not sure for BJJ that record is important since when you enter you get a clean slate, unless its Mundails or something.
BUT there is a correlation between competition and success.
For example I saw a coach for a wrestling club post his members off season matches and then next to that number he posted how they ended the year.
I am going to paraphrase but it looked something like this:
Wrestler A 80 offseason matches (YES 80 During the summer), following season result State title
Wrestler B 42 offseason matches, following season result 3rd at state
Wrestler C 29 offseason matches, following season result 2nd at regionals 6th at state
Wrestler D 20 offseason matches, following season result 3rd at regionals, State Qualifier
Wrestler E 15 offseason matches, following season result 2nd at districts, regional qualifier
So and and so forth so it showed a direct line between competing and winning against even the best opponents.
I think the same would hold true for any grappling sport. The more you actually compete to win the better you will become at that sport.
Now that I think about it, do you guys know anyone that does compete VERY often (say 20 or more matches per year) and has NOT gotten better?