BETFAIRS £40,000 CHAMPION MULTI CHALLENGE.

I have just been checking out the current positions after the first week.The overall leader is on 5833% profit.To begin with I was thinking that it was a really big score to beat.Then I read the rules & realized that obviously an even money multi is 100%,so if that is the case then the leader is only there with a 58.33 multi. I know in the last challenge they had,the odds that won the prizes werent that great.So my question is to all you maths boffins is,Have I got this right or am I missing something in my calcs ?.