What does joining Pyke's acting troupe help Karim to realize about social class?

Joining Pyke's acting troupe, and being around individuals of a higher class (particularly Pyke and Eleanor), helps Karim regret throwing away his education so readily. Karim realizes that the lower class attitude against education is what perpetuates their lack of opportunity to grow and become something other than lower class. It is a self-fulfilling prophesy.