You can theoretically sustain yourself though, especially if you started from beginning by playing Arena and getting daily quest rewards, but hearthstone is definitely pay to win. Addicting as well, would not recommend video games in the first place.
what does crashing at friends houses have to do with their loyality?
You might test how far they are willing to go to help you, but that's got nothing to do with loyality. I for one would likely never take any of my friends in unless it was very temporary and badly needed.