Nico Nico Nii!~
What people would want depends entirely on the people at your league.
In my area, most of the players are also collectors, so they're usually looking for very rare cards that they might not have, like Black & White's secret rare Pikachu card. Other holos just won't do for them.
Also, just a reminder before the conversation goes in that direction: there is to be no trading, buying, or selling here on the forums.