I don't think 1927 proof coins are unloved, I just think that a mintage of 15k for a proof coin is not low, and comfortably satisfies the demand of people who wants one. In addition the series also has a large number of circulating coins at UNC giving anyone an opportunity to get a type example.
The 1887 proof crown on the other hand has a mintage of only about 1k (and there are far fewer circulating UNC examples).