The prices that are displayed above as well as the announced price in UK pounds are higher than normal full price CDs (£15 = $27 = 23 Euro).
Single inventory releases may be good news for us SACD fans, but not for the regular music buyer and the artists, when the retail price contains such a "SACD premium". Most classical listeners don't care about high-rez or multichannel sound, they will only notice that the new discs are 20% more expensive than CDs, without any added value for them.
Because of the higher price, those discs will probably sell less than normally priced CDs, unless the repertoire is rare, like on this disc. For more popular repertoire, the competition by cheaper CDs (and even SACDs) will be tough. If the discs don't sell well, artists and the label will consider SACD as a commercial failure, although it is just a question of pricing.
In my view, in the current state of the music industry it is not possible to raise prices, even in the classical sector. Only SACD fans would be willing to pay more than for CDs. But single inventory items are destined to be bought by everyone, and not only by the small minority of SACD users.