Q. Do you realize that those fares from Allegiant Airlines are not what they seem? The advertised price does not include seat selection which they charge $12 - $15 each way, plus a $13.50 fee for buying online, plus a $7.50 priority boarding fee, not to mention baggage fees. So by the time you actually finish, the price has at least doubled. Were you aware of this?
A. Those are all easily avoidable frills. You don't have to pre-select a seat, and -if you're a light packer - don't check any bags. You can even avoid the $13.50 fee by purchasing your ticket at the Allegiant counter at the airport in advance, which is admittedly a little strange but still within the realm of doable.
With the exception of some fare wars, when air tickets are sold at less than cost of gasoline to drive (never mind the other operating expenses and time) this should be an indication that the sale involves little more than transportation.
Still, I'm a bit befuddled that $33 = "at least doubled" the cost of an airline ticket. I certainly don't see many $33 tickets available...
Still, as mentioned above, none of the additional fees falls under the category of "required."
Seat Selection: The largest US airline doesn't assign seats. At any price.
Allegiant MD-8x planes feature 2x3 seating. This means 80% are either windows or aisles. Most of the flights are fairly short, and none is really long. While a middle seat may not be ideal, is generally not unbearable. If it is unbearable to you, then it is probably worth spending a few dollars to avoid being in an unbearable situation :-) It, does, however, make sense to obtain seats in advance when families are traveling with small children.
Fee for buying online? Stop by their airport ticket counter. Of course, the counters are typically staffed only a couple of hours each day. Because tickets are sold "one-way" only, it does drive up the total cost a bit, but it is far more convenient than having to get to the counter when it is open...and maybe the fare is no longer available.
Priority Boarding? Allegiant does not overbook: as long as you arrive at the gate at a reasonable time, the plane isn't going to go anywhere without you. Of course, the last one aboard a full flight may have trouble stashing a rollaboard.
Checked bag fee? Packing intelligently makes this the easiest to avoid, even for families. While purchases on vacation can add volume, the baggage fee is tiny compared to sending a similar size/weight item via air express, and usually far less than ground shipping.
The fees are minor concerns. If they break the trip budget, then there probably isn't enough cushion to take the trip.
My main concern with Allegiant is that their COC does not provide for interlining: carriage is only on Allegiant. So, when things get out of sync, entire planeloads of people wait for an aircraft that only Allegiant can provide. I've seen a number of these crowds: it is hard to miss 150 people in the smaller airports served by Allegiant. And the wait can extend for many, many hours.
When it is the outbound flight for a long vacation, a low fare may outweigh the inconvenience. If it is a quick weekend getaway, the trip could be ruined. If it is on the return flight and someone has to get to work...
I know many people who are thrilled by Allegiant. But I would carefully research the reliability of the published schedule before booking on any carrier with a similar COC. This is particularly important where there is less-than-daily frequency.