SIA had a lot of generious numbers in Basketball the last two seasons. I have no idea how they could do it other than think they must cater to the low end bettor who doesn't care about spreads.
I tried for months to get the $500 sides and $100 totals in Basketball increased, instead they booted me. They paid and are great in my book. Keep betting into thier bad lines and you can make a killing. I ended up with close to $14,000 profit at $500 a game 2 years ago. It's as close as you can get to free money.
I have an account with them, any time I like a dog, I go there first, they always tilt to the fav, its amazing.. Guys buy half points and stuff, you can just open an account there, and get a point or more at times.. Great for dog bettors..