In c6 (interlude) they fixed a lot of problems, for example sleep was way to overpowered, and some stuff like cancel, and archers gained new skills, dagger classes became cool, people enjoyed playing with the tank classes, and a lot of more new things.
And yes, they want to get more money with lineage2 so they make new updates, what will you think if you pay for logging in at lvl 80 with top S items over enchant and augmented weapons just to beat some ppl? you will get tired soon and stop playing, that means less money.
They want to make people play more, making them level up more, if more lvl, more power.
Let me add that , in c1 no one reached top lvls, and it was weird to see ppl with good armors, that was the reason why ppl enjoyed more the game, it was more challenging and you really needed all the ppl to help you, now if you have a bd lvl 58, sws lvl 49, Prophet 56+ Shillen elder 56, in 1 or 2 months, you are lvl 75. If you have PoW/PoF/CoV, 1 month.