Many times the 1.5 point economy fares (Y and B only) are on par or only slightly cheaper than front cabin I (business) or A/P (first) fares.
1.5 points means you need to fly 66,666 miles. That means a couple trips to Asia or a few more to Europe. Creative searches can get you there quite easily.
The reason I bring that up is - 66,666 miles is a lot in coach. It might be more comfortable in the front cabin.