I have always considered the appearance of Barbers "cold." Just the plainness of the design. Compare to the seated liberty or
Mercury dime. That being said I used to collect
Barber quarters. Haven't looked at them in a while but still need the 96s and 01s. The 01 is expensive.
To answer what I think is your question; low mintage
Barber dimes are not sleepers. The US coin market is efficient. Pick up under graded coins if you have the eye.