Then you might as well join a big company, because the entrepreneurial/hacker spirit dictates that you _must_ be willing to learn something new every day.
Learning a new language to me would be just that; starting a NEW project. Instead, I'd like to take something I know well and learn to do even more with it. That to me would be an educational effort well spent.
In that vein I feel that working with other devs who code at my level on a collaborative goal would be something I have yet to experience and that I think I could learn alot from.