Match-fixing is crime. Bookies lure players to tamper with the match and there is a lot of 'illegal' money involved. It isn't pardonable and is dealt with sanctions including bans and jail-terms. In recent past, Pakistan cricketer Amir was handed a five-year ban for spot-fixing.
Betting makes up to 30-40% of global gambling market. There are several sports betting services across the world like William Hill, Ladbrokes, bet365, bwin, Paddy Power and betfair to name a few. There are betting shops as well. Billions of dollars are gambled each year.