I've been reading extensively in the past threads and the various answers are extremely confusing about "what is a good deal" for a MR, as well as how people are calculating their cost per miles?

Sometime people are calculating their top tier bonuses into the cost per mile while some others don't. They include the booking online bonus and others. I think the real cost per miles should be the value of the ticket divided by actual mileage (not including various bonuses). To illustrate it, let's say I spent 757$ for a SIN run out of JFK and I rack up 21000 Q miles, my real cost per miles should be 0.036 cents per miles.

Bonuses shouldn't be part of the calculation to get a real base for everybody to compare apple to apple.

This being said, now what is a real deal? Below 3 cents per miles? Below 5 cents? I understand that with bonuses you lower your cost per miles. However, If I'm not a top tier I have no bonus. Therefore, what is a good deal?

I'm a bit confused about this whole thing. Anybody could bring some light into this?