the price isn't too steep
£400 for 80GB comes out at £5/GB. Obviously amateur/home-users won't want to pay this, but it's not aimed at them. For commercial users, it compares favourably with the cost of enterprise storage (esp. when you consider the extortionate amounts they charge for proprietary cache-ram and controllers to make their slow old disks perform at anything like the required pace).
In fact at that price a 1TB database could be implemented for £10k - assuming duplication for resilience/backup purposes. It would also perform 10 - 50 times better than the equivalent spinning storage, take up less space, generate less heat and require virtually no administration, tweaking or tuning.
It's within living memory that STK Icebergs provided 77GB in a cabinet, at a cost of many, many times one of these puppies. Corporations were extremely happy with the price/performance at the time and would gladly install these, now. The only question would be regarding the reliability/lifetime of the cells.