I asked them that same question about ncaa football this weekend, and was told that it only applies on pointspreads of 10 or more, because there is a direct correlation between the over and big spread.....Seems an odd rule for the top book out there, when everyone else takes them, but guess thats why they are the top.....
Just have to play those wagers elsewhere, and play the straight wagers at pinny...
Not sure why that would apply to the baseball though, although maybe since tonight's spread is high, its because of that....if line was closer to even, you probably could...