Incursions - Multiboxers Dream

[Kromtor]

Scout, 3-5 pilots 50k isk each
Vanguard, 5-10 pilots, 15m isk each
Assault, 10-20 pilots, 26m isk each
Headquarters, 20-40/30-50 45m/90m isk each

You also get LP which adds an estimated extra 25% value.

I'm assuming the larger fleet ones take longer on average to complete so the actual best isk/hour might not necessarily be the biggest ones but probably are given that you have an incredibly coordinated fleet.

And this is big pure ISK. I was making what I considered to be good money (enough to pay for all 14 accounts with plex) just running level 5 missions but that required converting a ton of LP to ISK in the player market. With just my accounts doing this I ended up crashing the WTB markets for implants and had to rotate hubs and do a lot of spreadsheet crap.