I can see me playing this game almost every night as its the only game the wife and I play so for us we will eventually get all the characters its just a matter of time and luck, but if its anything like GW1 you know you will get them eventually.
They probably did that on purpose so that you have to either do the infinity runs or drop a bunch of money into there game to keep it going so that it takes you awhile to achieve all the characters. You would need to do numerous quests first to obtain stars to do the infinity runs at 5 stars a run and then maybe about 45min-1hr each run or spend hundreds of dollars/numerous multiplayer/garden ops runs to open packs your choice guess that is why they a legendaries.
