Yeah, I don't think you need to worry about your electrical unless you have a old place. Mining with HDs isn't like mining with GPUs. Unless you have a old house with old wiring, you probably can pull close to 1600w from the outlet. Most places are rated for 15amp circuits (1800w), sometimes 20amps. Watts are ampsXvolts. HDs are like 6w a piece.
You'd need a LOT of HDs to get close to that and of course a PSU able to reach that. I set up a 220v service for myself back when I did GPU mining and needed real power, but since then it seems sorta like a waste.
It is a shame. Since this is the only capacity oriented coin, if it goes belly up or the price doesn't increase, that's a lot of storage space that basically no one wants. If price of the coin doesn't naturally increase, the triage from the block rewards decreasing willy slowly kill off mining (and possibly the coin). Although the block rewards decrease really slowly with Burst, I've seen it kill off other coins before.
The expectation is the market value of the coin will increase as supply decreases (artificially decreasing the supply will increase the value), but that doesn't always determine the value. The market may just say fuck it, especially if social factors cave, such as the coin is no longer profitable to mine and therefore, no longer generates buzz or attention. With PoS coins, the developers greatly underestimated the influence the miners themselves had on how popular the coin was. Even though the 'fee' of mining was gone, many coins quickly fall by the wayside because no one talks about them anymore, and therefore no one uses them anymore. Mining perpetuate coins as much as it 'costs' the coin market.
In my personal opinion, you could essentially say mining makes and breaks coins. As soon as the mining dries up for Burst, for instance (although that's a ways off), Burst better have a very well established foothold in the Cryptocurrency world or it will dry up as well.
We can assume people who bought drives for Burst will mine till the end of time, since there is no other Crypto coin, network difficulty will only increase. So if price doesn't increase, we could see the effects of this start to happen in the next few months.
I honestly never understood why coin developers put a decreasing or changing block reward on a coin, I think this stems from developers really having no understanding of economics (sorry devs). It's supposed to 'reward' early adopters (and in some cases help finish a coin mine), but all it does is kills interest when it finally gains traction, especially with a coin that already has more going for it. Block reward should always be static on a coin, with the exception of fees. This would all be determined by the market instead of the developer trying to artificially influence the market through changing the supply.
Instead you create a artificial 'bubble' of profitability, which fades over time, especially if the coin doesn't gain a foothold or increase in value.
Really you should have a static block reward + fees, which never changes. The value of mining is determined by market worth. Coin mining would just cut off at whatever cap you want it to eventually reach. To that end, I don't think I've ever seen a coin gain 'value' by being fully mined. Usually at the end of the mine, there is a big 'boost' which is usually just a pump, and then it's all dumped and the coin fades to nothingness as they don't have anything going for them besides mining, which was driving all the interest.