I have been offered several times but the only time I did was at a practice tree race in November and it worked out in my favor. In 09 when I was in the finals at Pomona for the Summit Championship where it is a winner take all ($5,000.00) and I declined. I did lose but have never regretted not splitting. I believe all the other times I declined it worked in my favor. I've been told that not splitting when asked was poor sportsmanship. I don't see it that way at all. However I always offer my opponent lane choice.