If you are not having fun, then you are missing the point.
The regular rules award a prize to the player with the "correct" answer to each question (the closest answer without going over). We have added what we think is a fun variant along the same lines. We now award a prize to the player who receives the most "votes" from the other players. That is, the answer that has the most cubes of a colour other than the one on the answer card receives a prize.
During our first attempt, we awarded 10 points (one blue chip) the the player with the most cubes from other players.
The variant worked great for us. We had gotten into a pattern of answer a little too low in order to stay under the correct answer. With The Bluffer variant, the answers are a touch higher because you don't want to be the player with the answer of 800 when someone else guesses 801. That's because people generally place their bets on big gaps, so the player that underanswered is out of the running for the extra prize.
The variant also adds a great deal of table talk as players try to convince other that their answer is the right one. That's where The Bluffer name comes in. Great fun!
BTW - we originally thought about awarding the player who received the most money bet, but it was harder to count that than to simply count the blocks. This game is about simplicity and fun, so we went with the easy, quick method.