I was wondering about the DBL up feature on some VP machines, I
thought I had read on here that the DBL up option is a 50/50 chance,
and doesn't affect the over-all % or return of the machine, if you
play it.
What would happen if you DBL up and when you TIED the dealer, you WIN
the DBL up bet then ? How much would this affect the payback of the
machine and if so, would it be better to DBL up more then once and
keep going, or would it be better to play at a higher Denom and try to
DBL up after winning anything at all .....
Who are the math whizzes on this board ??? 
-L