Training...?? ROFLMAO
I worked in music stores for years, and never received a lick of training from ANY keyboard company. In fact, their reps would call ME up with questions about their own products!
It is up to the store employee to train himself. Greater knowledge means more sales. More sales means you can demand greater scale or commission, or you just take those skills to the competition. Not many stores pass up on a technically savvy, sales savvy employee, no matter HOW hard the squeeze is on....
I outsold all the mail order places in my area because I offered technical support, tutorials and tips and tricks ONLY to customers of our store. My demos were concise, and I didn't turn them into tutorials. I just pointed out that that knowledge would be available to them AFTER they bought from us... Most of the time, that was sufficient.
Good help can STILL make money, the right way.
But you need more than a Burger King reject for that...
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An arranger is just a tool. What matters is what you build with it..!