Good question Paulie.
I think Danielle just heard "$500,000" and signed up.
I don't think she can have seen either of the first two series.
One thing I do find interesting that we should probably take note of is that Dani said she did her "1 down 11 to go" countdown only a couple of times, then was asked to do it each time she went into the diary room.
There is a slim possibility that the hg's might feel she was led into saying certain things by the pointed questions of whoever was in control of the dr at the time.
I know this is only a slight possibility, but I have heard others complain at the questions they were asked in the dr and how they had had bad dr sessions because of it.
If I were an evicted hg and Dani and Lisa had treated me identically I would have to give it to Dani for that very reason Miss F.
I can see someone like Josh bringing up Lisa not playing the game until Eric left and using that logic to give his vote to Danielle.