A highly questionable (from an ethical POV) implementation of a slot machine

SlotMachine.js

var SlotMachine = (function () {
  //prettier-ignore
  var invalidBetError = new Error("Bet should be a number between 1 and 10");

  /**
   * @params params Object { maxRounds: number, maxWins: number }
   */
  var SlotMachine = function (params) {
    var winCount = 0;
    var roundCount = 0;
    var maxRounds = (params && params.maxRounds) || 10;
    var maxWins = (params && params.maxWins) || Math.ceil(maxRounds / 10);

    return function (bet) {
      if (typeof bet !== "number") throw invalidBetError;

      bet = Math.floor(bet);

      if (bet < 1 || bet > 10) throw invalidBetError;

      do {
        var draw = Math.floor(Math.random() * 10 + 1);
      } while (winCount === maxWins && bet === draw);

      roundCount++;

      if (roundCount === maxRounds) {
        winCount = 0;
        roundCount = 0;
      }

      if (bet === draw) {
        return { win: true, bet: bet, draw: draw, message: "You won!" };
      } else {
        return { win: false, bet: bet, draw: draw, message: "You lost." };
      }
    };
  };

  return SlotMachine;
})();