Most studies show that the members of rural communities who are most likely to migrate to urban centers are those who have been to school. The studies seem to show a consistent positive correlation between an individual's level of education his propensity to migrate.
Education brings a level of exposure, so it is understandable for someone who is very educated and exposed not to want to remain in a rural setting where they know that they are more exposed than the people around them.
REASONS (1) The income gap between what the 'educated' ones can earn in urban areas compared with their rural opportunity cost is larger than it is for the illiterate ones.(2) The educated ones are more likely to obtain a lucrative modern sector job. But because jobs are scarce,a large proportion of those who migrate often remain unemployed.
There are still numerous opportunities in the rural settlements, sometimes even more than the opportunities in the urban settlements. If you are business oriented, for instance, an agricultural business can flourish largely in a rural setting more than in an urban setting, so if you're an educated individual, and maybe your only intention for moving to the city is for the sake of seeking a job or better financial opportunities, there are financial opportunities sitting all around you in rural areas that are blessed abundantly with vast available land for farming, even commercially. So that money intended to go make in the urban areas, you can actually be in the rural area and make lots more.
If you are job-oriented, then rural to urban migration is understandable for you.