Not sure if it is about shifting the rewards from lab to adventure.
Rewards for seasons spent on the lab or library are mostly extrinsic. They are increases in power level (by raising Arts and Abilities), new spells, new items, etc. Adventures have (usually) lower extrinsic rewards, and (should) have higher intrinsic rewards.
Every magus is, or should be, a person with goals and motivations, reflected in their story and personality flaws. Unless this goal is "reach Ignem 40" or "invent a ritual to incinerate the entirety of England" this isn't something that is going to be accomplished without leaving the lab. And if your goal is to reach Ignem 40, there is really no need to have a troupe for that. It's purely a character building exercise. If the goal is just to discuss effects, then we have this forum.
It's tempting to just stay at the lab because in the end of the day, we aren't our characters, and magi have so much more incentive to stay (differently from companions, where they usually grow faster by adventuring then by sitting and reading). My magus may be driven to slay a dragon, but I'm not. And I can always rationalize and say "well, I may study for the next 50 years and go slay a dragon when I'm an archimagus". So part of the storyguide's burden is to transform the personality and story flaws in adventures that actually do progress the character goals, providing enough intrinsic rewards, and part of the player's burden is to actually play the magus they built (or even a step before, build a magus that is actually playable, from a saga perspective).