I do train quite a few people, although I am focusing my efforts primarily on veterinarians and police/fire/animal control officers for what I think is the greatest overall benefit.
Online articles are the best I can offer people who don't live anywhere near me. I can't exactly drop my whole life and drive or fly halfway across the country to teach individuals. Did you expect that I should?
Even if an individual does live near me, there are still concerns. There are some really untrustworthy people on the fringes of the herp community, people who steal things or are involved with drug use, and I don't want any of them in my house. I need to know and trust someone before I am willing to let them anywhere near my collection. In particular I need to know that they won't do anything stupid; I take a significant risk of legal liability in allowing anyone near my venomous snakes. I absolutely cannot risk allowing anyone who is under the influence of alcohol or drugs in my facility.
There have been a few people who have asked me to train them who came off as just plain rude, immature or only interested in taking up my time and not offering anything in return. I'm not just talking about cage cleaning help either. What I want most is for somebody I'm training to pay it forward. I want to see some real effort and dedication towards rescuing and rehabilitating snakes, or towards conservation, or some other goal that genuinely helps the animals. Those are the people I'm always willing to train.
Veterinarians and public safety officers (Fish and Wildlife, animal control, sheriff, police, etc) are at the top of my list because they can potentially help a lot of snakes if they can learn to handle them safely. Wildlife rehabilitators and nuisance wildlife removers qualify also. I'll go to some lengths to make sure that these folks get training. People who just want a cool pet are at the bottom of my list, and they're totally off my list if they aren't willing to work and give back something in return.
Training people is definitely a two-way street. The person wanting training has to be willing to work hard and to present themselves professionally just as they would for a job interview. It's not something you can whine for, demand, or expect that people will give you for nothing. You are asking the person who will be training you to give you hours of their time and to assume a huge liability risk by letting you into their facility. You should be prepared to make sure that you are offering something of value to your trainer as well as taking it.