Each Czech spends almost CZK 10,000 on betting yearly - Prague Daily Monitor Each Czech will spend almost CZK 10,000 on legal lottery and betting this year, up from CZK 9,000 in 2005 and CZK 6,000 in 2000. Besides, the popularity of betting on the Internet is growing, although this activity is still illegal in the Czech Republic.
...

Some 37 percent of Czechs take part in lotteries or betting, and more than half of them place a bet at least once a week.

Four
percent of Czechs do the illegal odds-betting on the web and another 12
percent are contemplating this option, said the International Business
and Research Services agency.

This is a very surprising number when it comes to betting offices. I've noticed more and more betting offices around Prague and fruit machines in pubs but never realized that so much money was spent per persion. However, lottery has always been popular in the Czech Republic (even in socialist Czechoslovakia). The words Sazka (from sázet  = to bet) and the derrived Sportka will be instantly recognizable to any Czech as nation-wide lotteries. However, betting metaphors are not very common in Czech. While you can say o co se vsadíš? = You wanna bet? There is very little awareness of odds and no phrases like odds on favorite, or what are the odds can be found (although they probably have some equivalents).