I had a successful bid of 130 Euro Y to J from CGK to BKK a few weeks ago. That was great value for a 3 hour flight - particularly since I got FB miles as in J while the original ticket was non earning. That alone was worth 1/3 of what I paid. They set the minimum on something above 2 Mio IDR = 120 Euro or so.

The 875 k (I assume) IDR KUL-CGK above is of course superb - 50 Euro, lounge, real business seating, excellent service, and a good stack of miles and status miles.