I'll start by saying that having a rep has only two advantages to me - early access to certain coins and increased limits on some coins.
But, for those privileges, you
have to manage the rep
. The reps get a little twitchy if you don't place orders through them (phone or e-mail). My rep tells me she "can't manage my account properly" if I place web orders - yet she knows when I place them so obviously she can see that I ordered and thus could 'manage' them. I suspect that she doesn't get credit (read commission or bonus) for the sale if I do it myself. At the very least, orders received by a rep are an employee performance measure so she needs the order to go through her.
She'll also tell me that ordering though her is easier to which I laugh. Here's my process. I log onto the mint website, look for items I want. Put them in a shopping cart and then, delete the cart and compose an e-mail or make a phone call to my rep hoping that she's working and wait for her to place the order and send me confirmation. Then I wait a day or two for the order to appear on my website profile - sometimes they never do show up on-line so I can't see them
. I have no idea how she thinks that is 'easier' for me. But it's part of the game that one must play to get access to coins like the Glass Butterfly
Occasionally, I will order from the advance e-mail that she sends (before items are on the website) but I would only do that if I expect a sell out in less than a day (like the butterflies). Personally, I prefer to see the coin on the website because the advance e-mails don't have as much information or detailed pictures.
In terms of a rep providing additional help with orders? I'm skeptical. My seriously delayed orders don't get shipped any faster because I have a rep.
So having a rep will get you that once a year super hot coin that might sell out in minutes under generally MC release. Or if you need more than the limits of some coins, they might be able to help. Other than that, having a rep is a bit overrated IMO.
That's not to say that if the mint improves the process (which they are supposedly doing), that having a rep might become more advantageous.
Generally speaking, I think you get a rep by them
rather than you asking for one. The price of admission appears to be north of 3K or so and you need to buy many coins (not just a few high priced ones), but if you fit the profile and don't have a rep, calling might get you one as they realize the potential in having you as a client.