There are good reasons not to have an internal PSU, additional expense, more heat to get rid off, and there is no problem convincing customs that it's not a mains power device that requires certification. If you need other cases, have them made and perhaps sell them on eBay as well. All the BFL models except the 500GH/s use external power supplies.


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- The cost savings between the slightly smaller case can't be all that significant - I bet that any standard configuration, ordered in bulk is <$50.
- A high quality (gold rated) PSU will generate little additional heat inside the case and is obviously easy enough to design for servers with far larger power requirements.
- Customs is either going to want to open the case and look inside or they aren't. I can't imagine the size of the case nor the amount of free space inside will convince them one way or another.
- yes, the components could be moved to a case, but that takes extra time and money that shouldn't be needed. All Avalon units allow for an internal PSU. Yeah, they got stuck in customs - no I have no idea whether this is part of the reason.

I don't buy those reasons as justification - I still see this as a less efficient way to run 100+ of these units in a large operation. For the small miner (myself included) it's no issue - it's the serious mining operations that won't be as thrilled.