Check out the Customize Your Trading Combine page - you don't have to go for $50K/5 cars/10 days.

Other options are available, such as 3 cars with a $30K account with a goal of $1500 over 10 days or $2000 over 20 days. The latter is only $100/day.

Read the fine print, however - it says a funded account will only be offered to those that earn at least $2000, so if you want to be funded the the goal for the $30K 10 days would have to be $2000 - still only a $200/day average.