Well you firstly went wrong when you played it when it was going to cost £32 for a red series (which isnt a real problem).
However playing on after a following dead board snt to good of an idea, you are pretty certain to lose here, unless it decides to roll of course.
Dont get me wrong, i forgot my key one day and went on one which was over £70 off (i.e had just rolled), a 4 hour session followed of recycling red series's until an IM followed then dead dead dead.....
Ended up only about £30 down which considering the time i was playing was quite remarkable