There are many different variations of online slots, but of particular note are video slots. This type has many different variations in itself. Unlike some other traditional online slots, video slots do not require you to play max bet unless a progressive jackpot is offered.
Playing max lines might be a good idea, but a max bet is often not necessary, as you can often bet more than one coin in a line.
To illustrate this point, a 20-line slot with a bet of 10 coins per line usually has a max bet of 200 coins. Even playing with the penny coin sizes will result in $2 a spin. In most instances one coin per line is perfectly fine and you can play for as low as 20 per spin. A drawback to this however, is that your jackpots won’t be as high, because your wins are multiplied by your bet per line. An online slots game with a 10,000 coin jackpot and a max bet of 10 coins per line will then pay a 100,000 coins win at maximum bet. Playing with one coin per line will in turn only result in a 10,000 coin jackpot. That is the trade off between a low bet and a bigger win.