Should I get Genesis 30 or wait until the mini-dungeon event starts again?

I don't think so. All you need to do is take one look at http://www.southperry.net/forums/showthread.php?t=224 to see how crazy people are about preparing for this. You don't think they'd buy skillbooks if they could?

The pirate population will still be lower than the population of Bishops. The only reason that Gen 30 costs 500mil is because the demand is particularly high.

Also, the release of pirates will mean the release of the pirate skillbooks with the appropriate monsters dropping them. It'll be long after they close the second event before we find out which skillbooks will be lacking.

I believe Nexon will also fix it so level 10 books are 3k and the others are 4.5k. I believe that's how it was supposed to be anyways.

That's what I think too. Nobody would be that dumb as to get a Zakum drop for 4500 rather than a HT drop for 3000.

The safe thing to do would be to get genesis 30 now, or risk getting screwed over later. It might pay off thought if they really do add pirate skills, as they set the realease date of pirates in november. but then again, its nexon, so who knows when pirates will be out ;o

Precisely. If Nexon reverses (fixes) this, then you'd have an even tougher time trying to get either Gen 30 OR Pirate skilbooks (assuming they're even giving out pirate skillbooks). I wouldn't gamble 4xx mil if I were you.