I've read the source and context of that and it's really not impressing me as a rational thing to do... it's a clever/smartass thing to do, but in what way did Ilyssa win? Surely she didn't expect Eric to enlighten her on the subject in some way she hadn't thought about before, and now she is "miserable about Eric", and didn't get to enjoy Hamlet.

The "I can't stop myself" says it all - she can't choose not to defect. That's not a strength.