With regard to the ratio 1/10 , P5 is manageable than P4 which is manageable than P3. The issue here is PRIZE RATIO, I will rather opt for $5000 prize with a cost $1000 than a cost of $100 for $500.
Lets take the string 672804 off the MO's eve draw 3018( 8/2/2016), considering 6C4 (with digit order), we generate 360 combos:
Permutations without repetition (n=6, r=4)
Using Items: 6,7,2,8,0,4
List has 360 entries.
{6,7,2,8} {6,7,2,0} {6,7,2,4} {6,7,8,2} {6,7,8,0} {6,7,8,4} {6,7,0,2} {6,7,0,8} {6,7,0,4} {6,7,4,2} {6,7,4,8} {6,7,4,0} {6,2,7,8} {6,2,7,0} {6,2,7,4} {6,2,8,7} {6,2,8,0} {6,2,8,4} {6,2,0,7} {6,2,0,8} {6,2,0,4} {6,2,4,7} {6,2,4,8} {6,2,4,0} {6,8,7,2} {6,8,7,0} {6,8,7,4} {6,8,2,7} {6,8,2,0} {6,8,2,4} {6,8,0,7} {6,8,0,2} {6,8,0,4} {6,8,4,7} {6,8,4,2} {6,8,4,0} {6,0,7,2} {6,0,7,8} {6,0,7,4} {6,0,2,7} {6,0,2,8} {6,0,2,4} {6,0,8,7} {6,0,8,2} {6,0,8,4} {6,0,4,7} {6,0,4,2} {6,0,4,8} {6,4,7,2} {6,4,7,8} {6,4,7,0} {6,4,2,7} {6,4,2,8} {6,4,2,0} {6,4,8,7} {6,4,8,2} {6,4,8,0} {6,4,0,7} {6,4,0,2} {6,4,0,8} {7,6,2,8} {7,6,2,0} {7,6,2,4} {7,6,8,2} {7,6,8,0} {7,6,8,4} {7,6,0,2} {7,6,0,8} {7,6,0,4} {7,6,4,2} {7,6,4,8} {7,6,4,0} {7,2,6,8} {7,2,6,0} {7,2,6,4} {7,2,8,6} {7,2,8,0} {7,2,8,4} {7,2,0,6} {7,2,0,8} {7,2,0,4} {7,2,4,6} {7,2,4,8} {7,2,4,0} {7,8,6,2} {7,8,6,0} {7,8,6,4} {7,8,2,6} {7,8,2,0} {7,8,2,4} {7,8,0,6} {7,8,0,2} {7,8,0,4} {7,8,4,6} {7,8,4,2} {7,8,4,0} {7,0,6,2} {7,0,6,8} {7,0,6,4} {7,0,2,6} {7,0,2,8} {7,0,2,4} {7,0,8,6} {7,0,8,2} {7,0,8,4} {7,0,4,6} {7,0,4,2} {7,0,4,8} {7,4,6,2} {7,4,6,8} {7,4,6,0} {7,4,2,6} {7,4,2,8} {7,4,2,0} {7,4,8,6} {7,4,8,2} {7,4,8,0} {7,4,0,6} {7,4,0,2} {7,4,0,8} {2,6,7,8} {2,6,7,0} {2,6,7,4} {2,6,8,7} {2,6,8,0} {2,6,8,4} {2,6,0,7} {2,6,0,8} {2,6,0,4} {2,6,4,7} {2,6,4,8} {2,6,4,0} {2,7,6,8} {2,7,6,0} {2,7,6,4} {2,7,8,6} {2,7,8,0} {2,7,8,4} {2,7,0,6} {2,7,0,8} {2,7,0,4} {2,7,4,6} {2,7,4,8} {2,7,4,0} {2,8,6,7} {2,8,6,0} {2,8,6,4} {2,8,7,6} {2,8,7,0} {2,8,7,4} {2,8,0,6} {2,8,0,7} {2,8,0,4} {2,8,4,6} {2,8,4,7} {2,8,4,0} {2,0,6,7} {2,0,6,8} {2,0,6,4} {2,0,7,6} {2,0,7,8} {2,0,7,4} {2,0,8,6} {2,0,8,7} {2,0,8,4} {2,0,4,6} {2,0,4,7} {2,0,4,8} {2,4,6,7} {2,4,6,8} {2,4,6,0} {2,4,7,6} {2,4,7,8} {2,4,7,0} {2,4,8,6} {2,4,8,7} {2,4,8,0} {2,4,0,6} {2,4,0,7} {2,4,0,8} {8,6,7,2} {8,6,7,0} {8,6,7,4} {8,6,2,7} {8,6,2,0} {8,6,2,4} {8,6,0,7} {8,6,0,2} {8,6,0,4} {8,6,4,7} {8,6,4,2} {8,6,4,0} {8,7,6,2} {8,7,6,0} {8,7,6,4} {8,7,2,6} {8,7,2,0} {8,7,2,4} {8,7,0,6} {8,7,0,2} {8,7,0,4} {8,7,4,6} {8,7,4,2} {8,7,4,0} {8,2,6,7} {8,2,6,0} {8,2,6,4} {8,2,7,6} {8,2,7,0} {8,2,7,4} {8,2,0,6} {8,2,0,7} {8,2,0,4} {8,2,4,6} {8,2,4,7} {8,2,4,0} {8,0,6,7} {8,0,6,2} {8,0,6,4} {8,0,7,6} {8,0,7,2} {8,0,7,4} {8,0,2,6} {8,0,2,7} {8,0,2,4} {8,0,4,6} {8,0,4,7} {8,0,4,2} {8,4,6,7} {8,4,6,2} {8,4,6,0} {8,4,7,6} {8,4,7,2} {8,4,7,0} {8,4,2,6} {8,4,2,7} {8,4,2,0} {8,4,0,6} {8,4,0,7} {8,4,0,2} {0,6,7,2} {0,6,7,8} {0,6,7,4} {0,6,2,7} {0,6,2,8} {0,6,2,4} {0,6,8,7} {0,6,8,2} {0,6,8,4} {0,6,4,7} {0,6,4,2} {0,6,4,8} {0,7,6,2} {0,7,6,8} {0,7,6,4} {0,7,2,6} {0,7,2,8} {0,7,2,4} {0,7,8,6} {0,7,8,2} {0,7,8,4} {0,7,4,6} {0,7,4,2} {0,7,4,8} {0,2,6,7} {0,2,6,8} {0,2,6,4} {0,2,7,6} {0,2,7,8} {0,2,7,4} {0,2,8,6} {0,2,8,7} {0,2,8,4} {0,2,4,6} {0,2,4,7} {0,2,4,8} {0,8,6,7} {0,8,6,2} {0,8,6,4} {0,8,7,6} {0,8,7,2} {0,8,7,4} {0,8,2,6} {0,8,2,7} {0,8,2,4} {0,8,4,6} {0,8,4,7} {0,8,4,2} {0,4,6,7} {0,4,6,2} {0,4,6,8} {0,4,7,6} {0,4,7,2} {0,4,7,8} {0,4,2,6} {0,4,2,7} {0,4,2,8} {0,4,8,6} {0,4,8,7} {0,4,8,2} {4,6,7,2} {4,6,7,8} {4,6,7,0} {4,6,2,7} {4,6,2,8} {4,6,2,0} {4,6,8,7} {4,6,8,2} {4,6,8,0} {4,6,0,7} {4,6,0,2} {4,6,0,8} {4,7,6,2} {4,7,6,8} {4,7,6,0} {4,7,2,6} {4,7,2,8} {4,7,2,0} {4,7,8,6} {4,7,8,2} {4,7,8,0} {4,7,0,6} {4,7,0,2} {4,7,0,8} {4,2,6,7} {4,2,6,8} {4,2,6,0} {4,2,7,6} {4,2,7,8} {4,2,7,0} {4,2,8,6} {4,2,8,7} {4,2,8,0} {4,2,0,6} {4,2,0,7} {4,2,0,8} {4,8,6,7} {4,8,6,2} {4,8,6,0} {4,8,7,6} {4,8,7,2} {4,8,7,0} {4,8,2,6} {4,8,2,7} {4,8,2,0} {4,8,0,6} {4,8,0,7} {4,8,0,2} {4,0,6,7} {4,0,6,2} {4,0,6,8} {4,0,7,6} {4,0,7,2} {4,0,7,8} {4,0,2,6} {4,0,2,7} {4,0,2,8} {4,0,8,6} {4,0,8,7} {4,0,8,2}
Lets see how many str8 hits within 10 draws(still below the threshold of prize tag).