The cost of 60 credits compares with 40 credits when the 1911 Census was released, so it is more expensive, but not by that much (since in 2009 there were no discounts for existing subscribers). Even when the 1911 Census became available as a subscription it cost £59.99 a year, or £39.99 for 6 months.
Also, whereas we got just one household from the 1911 Census, we'll get an entire page from the 1939 Register (or two pages if the household we searched for is split), so if there were relatives living next door (or we're just nosey about the neighbours) we'll get rather better value for money.
As with the 1911 Census, this initial release will attract people who aren't family historians - and hopefully some of them will take up our hobby as a result of what they find. I don't suppose many experienced family researchers will pay to look at more than 5 or 10 households from their tree at this stage - although we can't assume that it will follow the same price trajectory as the 1911 Census (it will depend how long the records are exclusive to Findmypast).
Annoying though it may be that the launch price is higher than most people expected, it should mean that - as in 2009 - Findmypast will recover most of their investment from casual searchers, rather than from us. Which, taking a longer-term view, can only be a good thing!