Well...I don't have a 15%'er...but I have both a 14% enchanted Half Moon (req 8, zealous, armor +5 vs. all) and 14% stance short bow (req 8, earth dmg, armor +6 vs ele.). I'd even let ya have 'em both for 40K. What's 1% anyway...well, a "normal" 100 point hit would register 114 vs. 115. Big whoop. Never gonna happen in PvP anyway (very rarely, in any case).
28% dmg for 40K > 15% for 50K.
...and honestly, most people with a 15% whatever shortbow/half moon ask ridiculous prices. Even a high requirement one (11-12).
Just that time again (time to make a lil room in storage, that is).