While L4 missions generate direct ISK payouts through mission rewards and NPC bounties, the largest income generator when it comes to mission running are the LP rewarded for every successfully completed mission, excluding storylines and epic arcs. They are tracked for every NPC corp separately, and can be exchanged at every station belonging to said corp in return for valuable items; be they faction variants of modules and ships, the blueprints to build said modules and ships, or implants. However not every LP stores is created equal - some offer excellent deals in excess of 2k ISK per LP, while others barely break 1k ISK per LP. Thus it is of extreme importance for every mission runner to be able to identify which LP stores are worth flying for, lest their income will suffer terribly.