It's not just the coaches...
Chilterns used to notorious for a poor attitude towards beginner kit. They tried to sell my wife a bow with a string which was *visibly* too short, and grumped about it when I pointed it out to them...
And I saw a compound (sold by Quicks) which arrived at the right draw length by having the wrong size of cams, and the wrong string length for the cams...
Our standard advice to new starters is "Don't go and buy kit on your own. Always take a 'coach' with you". Quotes (') because our club coaches aren't all qualified. But then this is one of those situations where experience counts more than qualification (oh, hang on, when is it ever the other way around?

).