We are Southwest fans. I book travel weekly for hubby for our business and pleasure. If you have a date far enough in advance you can get a great deal that might make it worth your while to go to Love Field. We pay $10 for parking in the garage per day.
We are less than 1 hr from both Love Field and DFW. I think the parking for DFW just went up to $18 per day. We do however park in the terminal, covered area and not offsite.
I fly hubby to Houston monthly for less than $120 on Southwest.
That said, sometimes American has some very competitive deals. I had a last minute flight for hubby and I went to my goto SWAir for a last minute ticket and it was just over $600 to AZ. I checked American and got a ticket for less than $350.
I work directly with the airline website and you can get good deals. You don't need agents anymore to book travel for you unless you are a newbie at doing it yourself or plan an ultra vacation somewhere with a true agent.
I've not seen many agencies around in a long time except for the MLM one that is out now with people signing up on that which is a crock.