i lost 3-4k bp in total when i sold my runes, but i didn't sell them all at once. i sold them slowly over a period of time so that my power loss wouldn't be so sudden. like, i capped my bp at 90k, and whenever it exceeded 90k, i took it as a chance to sell runes until my bp went down to 90k again. took me 3 weeks to save and redeem all 80 frags.

personally i don't see the point in selling runes all at once. it's not like you can redeem all 80 frags at once. even worse, the huge bp drop just won't help against people who are steadily growing. also it just looks really ugly lol. i also used this method to hide the fact that i was buying koh frags from the other people in my server.