I generally dislike kiais. 5 seconds is ok, more than that is pushing it. I wouldn't mind as much if it was only buyable for real money, because far fewer people buy things with real money, no matter the amount.
I'd rather give special features to someone who has helped the community than to some farmer.
Not only for real money... Kiai's are not premium items which need to be set as USD prices.
Maybe not 10 seconds but an additional 1 or 2 seconds would help so much! Every time I edit sound files I have to pretty much 'ruin' the extract because it has to fit in the 5 second mark.
So even if you like hearing kiais of your preference just mute them all to avoid hearing annoying kiais. And besides, what you find annoying other people may like. I used to have a section of a glitch hop track as a kiai and people said they loved it. I also had a women screaming everytime I got hit as a hit sound and nobody cared or they might have had music turned off.
Guys, the music volume button is there for a reason. Kiai's and other sounds can be disabled by turning off music or lowering the volume. This is what a lot of people do to avoid hearing loud or musical kiais. You should give it a go.