Trainees don't get yelled at for personal reasons, it's part of training, it can be and often is a motivational matter, conditioning, do something bad, guess what..... 

Came out and saw a car with a sign on it that said Real Estate Investor Seeking Trainee.

Just be careful not to fall for the "Real Estate Investor Seeks Trainee...$10K/month" scam.

Appraiser - 60 hours just to become a trainee.  

It's scummy because they profess to want to deconstruct the house for the good of their trainees and the environment, and it turns out that those aren't the primary reasons.

I also passed the US-PAP Appraisal Exam in NYC, but have not done my 2000 hour "trainee" portion as of yet {I was an appraiser in California - no reciprocity w/NYC - coastal rivals :(}. 

As a real estate appraiser trainee, I have some tools that give some interesting insight on any user defined boundaries and time frame that includes price trends, etc.

To protect my time and financial interests -which are significant - the contract specified that the trainee does not have a right to terminate the agreement early and I can only terminate them for breach of agreement obligation or criminal/unethical actions.

I would think a new wholesaler would be best served by either working with another wholesaler as a trainee or bird dog  or doing some buy and hold deals of their own first.  

I would steer clear of any arrangement where the mentor/trainer has tens or hundreds of trainees.