Like all ministry, youth ministry, whether in a parish or at a school, is not something people do for the paycheck. Parish ministry has a ton of night and weekend hours. Campus Ministry at a Catholic high school is more family-friendly, as the hours are more like a teacher's hours. There are a lot of overnight events like retreats and lock-ins. A person in this ministry must love working with youth. It is also important if you have a significant other, that he or she also loves the ministry. It is a huge time commitment for not a huge paycheck. But for those people who are service-minded and enjoy making a difference in the lives of youth, this career field is certainly worthwhile.
It is important to know that the burn-out rate for youth ministers is pretty high. Volunteering and internships are highly recommended before you commit to this career.
Also, the more quality training from professional youth ministry training organizations and networking communities that a person can get, the more likely they will be to enjoy this as a long term career.