How $100 becomes $160

Look, I consider myself as savvy as anyone in finding cheap airfares and not being surprised by hidden stuff or what gets charged for after the airlines brushed with another bout of dissolution when oil was $140, but adding 60% really calls for an illustration:

$100 Stated fare Spirit Air - New York to Fort Lauderdale

$+11 Taxes, ok fine we all know those are coming on the next page...
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$+9 Not using a $9 Club Sale Fare - hey I thought you just join and accept their emails and you get the discount - I didn't think you had to pay for the Club!
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$+30 Oh, it's higher if you don't buy a round-trip
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$+10 Oh, you want a seat on the flight too - well you have to pay to reserve that.

= $160

Plus it's something called Spirit with all the potential adventures of any unknown airline. This ought to be fun