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

Yeah, I'm kinda upset I got Genesis 30 and didn't get a Necomimi / New chair.

I thought I could make like 500mil with it, but now I can barely make 400m.

Next time, those two will be my only goals.

I'm in the same position as well. I fell asleep yesterday and missed FOUR runs. I'm so pissed cuz I wasn't able to get the chair and now I have spare tickets...
However, I don't feel at all regretful that I got Gen 30.

The logic behind this for you math folks out there:

1. Every two days, I buy two 5-ticket sets and a 2x drop card. (I do it at 10pm so that the 2x will last me 2 hours each on both days.) This means it will cost me 5100 NX every two days, or 2550 NX per day.
   
2. Thus, since the event was out for 13 days, I paid 5100 NX six times (for 12 days), and 3300 NX for the last day.
   
3. Which costed me a total of 5100 x 6 + 3300 = 33,900 NX.
   
4. To obtain my NX, I spend 5 mil on 60% glove att scrolls and resell in MTS for 1090 NX each.
   
5. Thus, my total cost in mesos is 33,900 / 1090 = 31 glove att scrolls
   
6. Which is 165 mil.

So don't be disappointed. You made at least 235mil (you said 400m) from this event.

With that kind of money, I was able to afford myself the Lv 103 fire staff that I would otherwise never be able to obtain.