All airlines break out the fuel surcharge in the listing of components in the total, fare, at least for those that care or are paying attention. They have done so for a long long time, and yes those change from time to time, usually going up.
It was reported elsewhere on this board that Spirit (at least, I think it was Spirit) assesses a $2 "unintended consequences" fee due to the limits on runway waiting times and so forth...but I cannot find that fee in the mix. The total "being clear" means that:
1) I can figure out what I am being charged (i.e. the total amount, as well as a reasonable breakdown); and
2) I can figure out why I am being charged that amount (i.e. What each fee going to the total is, and/or what is affecting it).
For example, on the fuel surcharge: Let's say that it lists at $49.88 (which is what it lists for several of the flights listed in your example). I can't clearly tell how it calculates, and that particular price may vary. Spirit's pains to break that amount out seems, quite frankly, to be "priming" people for that amount to move up without it actually involving a change in the fare. Again, I've seen this mentioned with respect to cruises.
The rules have changed and they cannot do so now. When the rules changed, it was not just Spirit and Southwest that were dinged. Almost every major carrier was because they piled on various charges between the time you saw the advertized fare and you bought the ticket. Only Spirit and Southwest complained loudly, while others simply started listing both the numbers up front.
And Alan hit on what was going on in my mind: While the ad I cited was old, there is a general tendency for folks to look at the stated fare and not the pile of fees that doesn't show up in the ad in question. "Additional fees apply" is exceedingly (and I would argue, purposefully) vague...particularly if one line has higher fees than others (which Spirit certainly tends towards the high end of)...and it is misleading when I'm showed a price of $XX.XX* and then when I get to the end of booking, I see a number substantially higher than $XX.XX
In a society that is set up specifically to be duped in various ways, why complain about some specific duping techniques as opposed to others? Afterall we are in general unique also in listing prices of things exclusive of taxes.
To be fair, I'm willing to allow that there aren't many saints left in this regard...but that doesn't mean that Spirit isn't a particularly nasty abuser of this. I would also note that some airlines take efforts to keep their fare/fee prices off of comparison sites (Spirit falls in this vein...note that the login function certainly serves to complicate bottom line comparison shopping). Also as noted, I can't get to a "total cost" for my flight without logging into their website in some fashion...again, making it hard to know what a flight is actually going to cost aside from "additional fees".
BTW, how do you figure out the total cost of a flight on any airline without pricing out an itinerary? How do you do so on Amtrak?