Why can't people accept Lipo?

I feel you. there's a big track about an hour and a half from me, that I've always wanted to run, but they don't allow lipo because they go by ROAR's rules.. which doesn't allow lipo.. I believe it has something to do with the track's insurance policy though.. blech.
picture of the track:


but, I just found this: http://roarracing.org/news.php
that will most likely help everyone using lipo, as it is finally going main stream.