Player props will usually pop up a few days before a game is going to start. Two weeks ahead of time it is near impossible to know which players will start, whether there will be a change in the lineup, whether a player will get injured, and other off-field factors that can affect this betting market. For example, how could you bet on Kevin Durant to score 10.5+ points three weeks ahead of a game, when you do not know whether he will be rested or not.