"Getting a market" horse racing.

[lambo]

Hi firstly an introduction I'm a former arbitrage trader (possibly one of the leaders in arbitrage) however I stopped this with the advent of the tax changes a few years ago.Subsequently I attended Peters' Masterclass which I thought was an eye opener and might help fill the gap left by arbitrage.
So for the last 5 or so years I have traded,I can't say I enjoy it as I did with arbitrage but I've clearly learnt value along the way somewhere as I find most sports easy to trade, my stock on trade is tennis and soccer.
Tennis I have an interest in but I cannot abide soccer as a sport but find it easy to trade,however my question relates to horse racing as I simply don't "get it".
I read Peter and others referencing undertsanding the horse racing market but I still have no idea what I'm doing,if you did the opposite to what I do you'd be rolling in money.
I'm guessing that as I have a maths background the slightly random nature of pre race trading does not suit me,so I ignore one of the biggest markets entirely because it frustrates me and I lose money on it.
Must be others in the same boat?