Local odds for colts/titans are...odd

[robinhood]

My local has the spread for the titans tonight set at colts -4, -110 each side. Ok, sounds like a typical square line. However, if I want to buy the spread down to colts -1 the juice is -210. The money line for the colts is set at -205.

Why does it cost less to take the moneyline than to buy 3 points?

[ncat12]

if ya like the colts tht much and the game is only a couple hrs away dont sweat it just tke the ml and worry about all the in's and out's at a later date..I to have ran across this ordeal b4 and won the bet and totaly forgot to follow up on why it was like that..winning cures all