Except for your age and liking reading, this is pretty much exactly my situation. I play maybe 10-20 games a week to get quests done. The first season of the month I actually try to ladder a bit, but beyond that I enjoy Hearthstone as a casual experience very much.
I also spend money on additional packs (exclusively pre-orders) to get more out of it. I think that's worth it, but if the gold income is basically completely halted due to my casual nature, I don't see why I should continue playing this outside of wild as long as that's viable with my own cards.