So in Mango's and Spinney's only the Managers are helpful and not the sales staff?

I think needs to start from the top and flow down too ;-) and IMO, the sales personnel do need to know the product they're selling.

Me: Is this HD Media player equipped with DTS/ Dolby Digital output?
Salesguy: I don't know, but if it did, it would say on the box.

Yeah duchebag, I'm literate you know and just coz it doesn't say on the box, it don't mean it isn't equipped with it.