The other side of this though, is that a player who has no estimates for that category doesn't get a bonus. Goalies get no bonus for scoring or assisting on a goal. Pitchers get no bonus for home runs. Special teams doesn't count for football. Don't let yourself get sucked in by the excitement of a defensive fumble recovery, or some such.
Bad games happen to good players.
If you bought a player before the game, and they don't perform, don't be afraid to sell that player. Especially if you think others will also sell. Start at the beginning of the month. WSS lets you legally have 3 accounts. They seem to tolerate a lot more.