This is actually a design decision, and it's reflected in the ionice(1) man
page (on jaunty):
...
Idle. A program running with idle io priority will only get disk
time when no other program has asked for disk io for a defined
grace period. The impact of idle io processes on normal system
activity should be zero. This scheduling class does not take a pri‐
ority argument. Presently, this scheduling class is permitted for
an ordinary user (since kernel 2.6.25).
...
Please note the minimum required kernel version.
** Changed in: util-linux (Ubuntu)
Status: New => Invalid
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Can't lower I/O priority with ionice as a user
https://bugs.launchpad.net/bugs/189304
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