I'm patiently waiting for the NBA to formally start so I can start betting a bigger amount, maybe that time I will be able to receive a free bet again.
You really do not need to bet bigger amount all the time to get free bet, check under bets if there is free bet available and if it does you can avail that if you are wagging over 1.5 odds. I think there was no restriction for the freebie this time as they said if Watford scores a goal everyone gets a free bet.
You do not "need" to but some people feel more comfortable with some other type of games and some like to play regular stuff like soccer. I have never really understood soccer for example and even though there are tons of people who gamble on it, I try to stay away from it. However when NBA starts I start to bet bigger and bigger, not just because there are stuff returned for it like promotions and bonuses, but because I really want to.
I would bet on NBA games bigger than other games even if there was no bonus or promotion tied to it. It is just about gambling on the sport you know and understand, if you try to bet on the team that looks like most possible to win in a sport you don't understand, you may get bigger upsets however if you know the sport very well you can spot potential upsets as well.