Wait until that stuff becomes 50cp per frag in one of the events eventually, like the current outfits.

Summon runes have diminishing returns too, I only ever use scrolls during the rebate and do the full 100 each time, however now that all 3 sets of my Runes are level 7, a rebate of 100 summon scrolls gets me less than half of one set of runes to level 8, so basically it's going to take like 5 more 100 scroll summon rebates to get all of my runes to level 8.

Before that, 1 rebate would get me a full set of 7s on one summon.