let me guess, maybank?

Yes, it usually costs a bomb. So far I have only been so loyal to Blizzard (all my Blizzard Games like Starcraft, Warcraft & Diablo series are all Original, some Limited Edition). Have it been other Game Developers, I might not be as loyal  not sure why though...
For HS, I usually only get the Expansion Starters (pre-Purchase), after that It's all gold for packs. There was only once, where I started to loose interest, and skipped the entire expansion. Blizzard is getting more generous nowadays, you will notice they giving away more Gold and Dust in the daily quests, so that in a way helps thoe FTP players.

The thing is, I personally believe that most players will usually have only 1-2 goto decks that they will always use for ranking.
Although the meta shifts from time to time, the main cards still sticks around. All you need is just sufficient dust for net-decking, and craft relevant cards. Same deck can easily take your through the entire month or more, so 50-60g a day still ok la. I still have enough dust for 2 Legends if I really wanted to craft any, but my current deck still works, so can save it til the meta changes.