Well the truth is alotbof person are actually addicted to sport betting as well. Let's say the football betting to instance, alot of gamblers gamble almost everyday though usually on weekends but also on the weekdays and trust me when I say some of these persons prefer to spilt their feeding money for the day just to gamble because they believe they can actually make out something off their little staked amount. Addiction doesn’t only apply to those who are losing huge amount of money, a gambler can claim they gamble with small stake but they gamble frequently, that is also an addiction, and the one that gets me laughing the most are situations whereby an addicted gambler is actually making consecutive wins and people term him as a good gambler, but if the table turns the actual name would be used
I also think that now betting has taken the leading place among gambling games, pushing gambling out, because we can often hear that betting is legal in some country and at the same time gambling is illegal.
You also correctly gave the example that many people make small bets, but because of this they do not think that they spend a lot of money on betting, although in fact this is how the path to big bets and big spending in sports betting begins and very few people manage to maintain self-control.