Apologies, we misread! You would be allowed to use repeat threads for bonuses, IE First use Thread X for AC, and then Thread X again for AC Rewards. That said, there's nothing stopping you from saving up, either! There would be no penalty.

We had to think about this one! We've decided that in general, at first your character would have to siphon magic from other magic characters, but further down the line there may be opportunities to siphon from the hotel instead!