I have hit many 99xx in the past but never even won $2 but free is free and 1 chance in 10,000 is still something to play for if you do not mind just clicking once. No brainer to try it every now and then right?
The chance to win 200 dollar in the free roll is not 1 in 10,000. The chance is 1 in 20,000. Because probability of hitting 0 and 10000 is half of probability of hitting other numbers.
Every time you play the free roll, a decimal number is calculated and is rounded off to the nearest whole number. For hitting 10,000 the decimal number must be between 9999.50 and 10000.