Buying many out of the money calls and selling the more expensive near the money calls is a fantastic way to make money "if" you are convinced about the direction of the market and looking for

a rapid move. For instance(I am not recommending this but I am watching on a daily basis)the coffee

options.If the market seems to have stalled and I can put on some " ratio backspreads" they could be very profitable.

About the bid and offers or spreads in options quotes.The bond market is extremely liquid and if you can call the floor direct it is not uncommon to get a "choice" quote where the bid and offer are the same.