To answer your question, it is hard to stop wanting another once you see how fun and loving a beardie can be, but if you do happen to get another, it should have a different set up.
Advantages - You save a little cash and space
Disadvantages You are putting a pet you are responsible for's life in danger. Usally the only time you see pairs is during breeding season, by an experianced keeper with years and beardies under their belts, or by people with sick dragons who do not know what they are doing, and are lowering their dragons life expectancy.
Males will fight males once they reach maturity
Males will breed females to death
and Female and Female can have Dominance issues.
Even if you do decide to try Female and Female, they need to be the same size and age, and you will need to Qt them for a few months in a seperate part of the house. They both will need their stools checked by a vet as well. So regardless if it works or not for three or four months you have to have a seperate set up anyways, So your really not saving in cash, and not space for a while.
Beardies are solitary creatures, they do not want cage mates or " Friends "
Hope this helps - Matt