A hypothetical situation....
Joe and Fred have flown to another airfield and are now flying home. The weather, which was forecast to be good all day, is now deteriorating, with lowering cloud and showers.
Joe: It's not looking too good, is it?
Fred: No. but we should be OK. It's not far.
Joe: There are a few hills ahead, and that cloudbase is getting lower. Shall we divert into XXXX?
Fred: Those hills aren't very high. And I really need to get back. I still think we can make it.
Joe: We probably can. But we might not, if the weather gets any worse. Is it worth the risk?
Fred: It's a very slight risk. It doesn't seem to be getting any worse, and we can always turn back if we don't like it.
Joe: I suppose so. But if the cloud gets any lower it might be hard to turn back safely.
Fred: I see your point. But I'd like to get back. And XXXX's landing fee is pretty steep.
Joe: That's true. I hadn't thought of that? And I suppose it really isn't all that bad.
Fred: Shall we give it a shot then?
Joe: OK
In other words, since I need to spell out my points in words of one syllable or less, landing fees might be a factor among others when a difficult decision is being made. And they shouldn't be.