While you are in formative years of your career especially academics, you generally don’t want to do any collaborative work. Even if you want to do, you just want to do some donkey work, you don't want to think and come up with new ideas. You want either to achieve things own your own or want to get them for free (without any hard work/thinking). If somebody offers you a work to do, you think a lot about your benefits and losses and if you find that other person is going to gain more than what you are going to, you leave the opportunity. I don’t know it prevails everywhere or just in India. Since I am from India, I know it exist there in the psyche of majority of the students and in some of my friends too.