I'm still getting back into Lineage 2 and I... I hate to say it, but the adena change might be good. Back when I played, me and my mates had a rule - you NEVER vendor mats. You always sell them to players if you want to make money. Now with the bots and autoplay, this is an even bigger issue - if mats gave adena, you could just jam a coin in your keyboard to hold down the loot key, go to ruins of agony and make an imbalanced amount of adena. There is also the problem with inflation, which is a huge issue on Live apparently, and a good way of dealing with it is making adena less available, so a lot of it gets sunk into the mechanics.
The way it is right now, and mind you I'm still new to this - you have to measure carefully your combat, to make sure you're not spending more than you're earning... which in my opinion is what makes Lineage 2 interesting and unique. This was a big deal in C1, where we couldn't afford to run shots all the time, and it is what makes running even autoplay interesting - it's not about the combat, it's about the meta, the economy.
I might be totally wrong, of course, and there's games that have better ways of dealing with inflation (like one of WoW's p servers nuking player gold every once in a while), but ultimately, I don't think Lineage can keep the old availability of adena with the current mechanics.