Are wholesale deals always non-nego?

[Marshall Hooper]

I just reached out to a wholesaler about putting me on their distribution list. She sent me two brochures and said "i need to know what margins you look for, tell me what you would have paid for these?". She then comes back with the actual prices they sold for (my bids were about 8-10% lower) and says that basically my margins are not a good fit for them. She then tells me that their prices are non-negotiable. However, the first brochure she sent me had their asking price for the property and the closing price on the sale was lower than the asking price, so obviously they nego'd on it. 

Is this normal behavior? Are wholesalers not flexible with their asking prices?