Yes, it is better for a doctor to continue their study after 7 years....it took about 10 years ... but i think it has worth...when a doctor see a patient are getting her\his health it cause very happily in doctor's heart...about money, Dentists and Plastic Surgeon earn much money in Iran...accepting medical in Iran is very hard because low percent in 'Konkur' that have been earned the great results can choose this major...my friend rejected for 4 years...but in except Iran accepting in medical is easier...many good doctor and Surgeon of Iran don't live in Iran any more, like 'Proff. Majid Samii'... i think doctors can help people very much...