Bookmakers always charge the users with an margin that they take from the stake of the players , most of the bookmakers charge between 2-6% of the value that you are risking , if both opponents in an event are equally good in strength , then still the odds will not be 100% value which should be their they will be less and the difference accounts for the margin of the bookmakers via which they make their profits , Some platforms take a high margin while some lower , How much margin is taken by bookmakers in your opinion ?