Ever since Star Wars: the Old Republic went Free-to-Play, it has contained an element of gambling. Cartel Packs, which cost real-world money, may or may not contain any items you actually want depending on a random number generator. And when the Dye Modules were added later on, it was another gamble - you could end up getting some dreadful color combo that makes your character look like a cheap knockoff action figure, which you can't even give away, or you could luck out and get Black/Black which is still worth 3 million credits.
Either way, it's always been a gamble. Basically, you have your choice between Craps and Roulette. You always get some kind of payout for your money, but the odds of getting anything good have always favored the House rather than the Player.
Game Update 2.8: Spoils of War adds slot machines into the mix. Actual slot machines.
Continue reading on SWTORHUB.com: Legitimate Gambling in SWTOR's Game Update 2.8: Spoils of War