Hearthpwn

I dust everything not neutral and Shaman/Druid/Priest (Asia) or Hunter/Paladin/Warlock (EU). I used to play the other three classes on the American server but I do not play there for a while now. Generally, I lost a lot of value until now by changing the classes and DEing everything and stuff but I am usually driven by impulses and am crazy bad at time, money and resource management. Now I'm pretty much set at these classes and am quite sure that won't change soon.

i play odd rogue/paladin and zoolock

but if i could play maly druid, togg, dr hunter, etc (whatever competitive) i would do it

Only played all the classes for gold heroes. I play all other classes but Druid. I find its playstyle boring, and haven enjoyed an archetype since vanilla token Druid. 

I am free to play that's why I can only play a limited number of decks competitively. But since I stopped dusting my cards my collection and the range of decks I can play grows as well. Furthermore this makes completing quests a lot easier. 

I even collect warrior and shaman legs although I don't like the classes. Oh and I stopped dusting golden epics because I hate crafting epics and you never know when you need one you dusted in the past.

Finally I play some wild from time to time which also forbids dusting cards. 

I play every class, i have cards for them and i find dusting cards rather scammy unless they're golden, also i don't like sticking to only one class when it is so easy to switch classes, this isn't an MMO. 
edit: Gotta admit there was  a time where i only played mage and rogue, and only played other classes strictly to compelte quests, but that was ages ago

I don't like Warrior and i only play it for quests (Wild Pirate).

I don't like Shaman and Priest EXCEPT (Wild) Even and (Wild) Inner Fire.

So, i profit of that situation, i regularly dust those classes (except the cards for the only archetypes i like), and better enjoy the classes i prefer.

Collecting cards and exercising creativity are the two main reasons I play, so of course I have to collect and play everything, and I don’t dust anything except gold cards (every single one).

I don't play mage and rogue. I just can't stomach to play them!

Mage doesn't interest me and rogue is super boring, imo. If you gave me a 1000 gold quest to win a single game with them I'd re-roll it asap xD

I dont choose based on class, i choose based on deck.

I basically never dust anything and never buy almost anything. I used to dust cards back when I first started during GvG as I wanted to have at least one viable deck, but I regretted dusting those cards at multiple occasions.

I stopped that behaviour shortly after I got myself my first reasonable deck even though they were for classes that I wasn't playing back then. I don't play every class every expansion, but every now and then I transition from one class to another as my taste changes and not dusting cards makes that transition so much cheaper and easier.