The stakes are just too high and the limit on time and funds you can safely earn just makes it feel stressful when it should be fun.
I can get the appeal of the risk/reward but it crosses the line from exciting and tense to anxiety inducing for me.
On top of that the game was kind of unstable on release and if you crashed it counted as losing the race and your wager etc and you cannot load an earlier save or anything, if that was the case the whole game would actually be decent apart from the lack of event variety.