A bit off topic : when I was 11, I went to a new school, where everything was taught in a language I barely spoke. You can't imagine how much pressure was put on me. Sure, I became fluent in this language in 2 years, but was it really worth it? I doubt so.
Quick and forced language learning isn't always beneficial.
I became fluent in another language in spite of being forced to learn the first one.
So, I'd say that doing things in spite might be a very strong motivation.