The playoffs attract more audience. I am not able to tell how much more, but you could maybe raise them a little bit.
Actually this is true, but not as true as it looks like here. ;)
Let me explain:
PO games do not draw more fans then regular games. However, the ranking of your opponent is taken into account when the number of fans is calculated, and because in the POs you play the top seeded teams, you get more fans than the average of all league games.
As an example: let's say you happened to play the top 1 team in your last league game, and now your first PO game is against the No 3 ranked, then you will have had more spectators in your league game (given all other factors are the same!!)
The opposite also holds true.
Winning or losing your last game however is a large factor, so here is an other example:
let's say you are the No2 and lost to the number 3 your last league game, and you play the same team, who remained in the No3 rank, in your first PO game, then chances are prety high your PO game will get less spectators.
They are not your friends; they dispise you. I am the only one you can count on. Trust me.