His plan to crack Potter was of secondary importance, though still significant. Unfortunately, the truth-telling potion, veritaserum, was ghastly expensive. Tom had money now, between his internship income and Tournament winnings, but not that much. Brewing veritaserum himself would be slightly more economical but would take more than half a year to finish, and he wouldn’t be able to start until he returned to Hogwarts and had access to a large enough space to set up a full potions lab.