I haven't checked to see what the numbers have been recently, but it seems like the public has been getting torched by ignoring the first "lull" factor in the NBA season.
This is where travel, B2B's, etc. start to take their toll on these players psychologically more than anything else (they claim physically, but I think it's more of an excuse heading into the holiday season). You've seen some ridiculously low-scoring quarters/games from certain teams who basically throw in the towel and move on to the next game before the horn sounds.
Just keep an eye on early and late line movement. It's not an exact science -- for instance, I ignored it tonight with my DAL/MIL over -- but you have to pick your spots and start paying attention to which teams have played a lot of games and traveled a lot of miles in a short period of time, both side-wise and especially with totals (depending on the general style of the team in the first place).