I <3 it when people make condescending posts that are wrong. [image: http://www.cardschat.com/../../images/smilies/wink.gif]
This is quite funny because this statement is itself both condescending, and in its implication that I'm objectively wrong, wrong.
OK 66 has more outs to a stronger hand, but with top set you're also going to be paying off another player holding 87s either to chase, or for value if you think your hand is good. What are you going to do, try to check it down as cheaply as possible? Many players will go crazy with top set on a board like this, reasoning that their hand is probably good and they have to price out draws, and if they're beat, they have outs - but end up getting their money in bad.
On the other hand, if another player is just on a spade draw, in order to win a big pot, the board is going to have to pair AND bring another spade. Both obviously can't happen on the Turn, and on the river it's a 45:1 shot.
Plus, holding 87s, you're in better shape versus a higher flush draw, because you have blockers which you don't with 66.