OK well I have done some more research, and now the number of selections is co-incidentally EXACTLY 376! Complete accident too, just said, "I'll research to this point then check the answers", and it had gone up to exactly 376 selections, which Woof said was the number I needed for a 99% accuracy level.

SO, here's the results after 376 selections:

selections - 376
wins - 116 (31%)
collect - 518.70
average dividend - $4.5
profit on turnover - 38%

Does this mean I can be 99% sure of the method holding up? Or something else? What does it all mean?!?!?!