There is a lot of discussion about controller support in the Path of Exile community. The game has been out for nearly five years, and in Diablo it's a feature that's been around for a long time, and nothing seems to stop you from doing the same in PoE.
The only initial concern was that Path of Exile was a more demanding title than most action RPGs. Boss fights are complex, require precision, and many popular builds have more activity buttons than Diablo or Grim Dawn. When Path of Exile came to consoles and built a new community among tablet users, those concerns were resolved, and players naturally had more ways to earn POE Currency.
But in my opinion, the easiest and most efficient way is to choose a reliable website to buy Exalted Orb, POECurrency is one of them. The site is currently holding a promotion, and players who participate in the event may enjoy a 20% discount. Come on!