I have the impression it is much more, at least from the observation of my last two games.
In the Finals, this weekend, we played both games with the same starting line-up, same tactic offensively and defensively, same enthusiasm (PON on saturday for both teams, POCT on sunday for boh teams).
I lost by 11 points on saturday and won by 14 on sunday (and i was leading by +26 before garbage time in the fourth quarter)
Of course, this is just one observation, but this has confirmed the impression gained in previous seasons that in the Finals, HCA is a huge advantage, a lot more than 8 or 10 points. What do you think ?