No you are wrong, you have obviously more chances to get at least one tail by tossing several times a coin than by tossing it one single time.
You have 1/2 chances(50%) to get a Tail when you flip a coin one time :
~snip~
Obviously there is more chance to get bigger prize from large number of WOF spins but this is just probability not guaranteed. I have made more than 83k bets in multiply game and claimed 17k+ hourly faucet. But I got the lucky number 10,000 only one time and it was during multiply game. Where many people get the top number within few rolls. So, I also think that the outcomes are random but it is fully luck based. Nothing can be changed in the outcome of WOF games by learning the odds.
It's almost the same for me I've never got the 10 000 number at the free btc game in more than 8 000 free rolls played while I got it several times at the multiply btc game in 127k multiply btc rolls played according to my personal stats page. So in my personal experience I got more 10 000 number wins with more trials.