hey c'mon, legit question there. He runs a business, not software
+1
The answer is that if you run a business and advertise a particular address for receiving money, then clearly that address is not anonymous (because you advertised it).
So, the convention for serious retailers like Dish and Overstock who use payment processors is to supply a unique address to each new sale.
Presumably the receipts can then be anonymised by the Darkcoin network and consolidated at holding addresses, so there's no way of your customers (or more importantly, your commercial competitors) following the trail from a payment address to your main "deposit accounts".
Conversely, it goes without saying that with bitcoin, that is altogether completely possible. (In fact it might be an instructive exercise for someone to make a purchase from one of the big retailers who accept bitcoin and attempt to discover their main holding addresses. Some of them do hold bitcoin).
P.S. XPY dumping continuing. It's now becoming established in the 3rd decimal place.