Quick question currency and telescope

Hi ! I'm fearly new to the game (got to the end of the 2nd world) and I've got 2 questions I can't find an answer for : -When you leave the game mid-run (I'm on ps5), do your telescope boon end if you continue your game at another cycle ? -What is the reason to unlock new spells with the peddler when I can buff myself with zim zim ? So far I never used my currency on new spells because the buff seems more important, but I may be missing something! Thanks !👍