Before I played the game I thought game is about collecting the highest VP but now when you fhinish 1-3-5 quest game will end. I belive most of the side quest become pointless and Its like removed feature.
Are there any plans for "new" game modes? Like Collect 9999VP ?

The game IS about collecting the most VP. Whoever has the most VP when the "game finish" condition has been met (1-3-5 quests), is the victor. This means that you have to juggle your strategy - do you rush to complete your quests as fast as possible and get their base VP, or do you try to do all the bonus stuff, support, investigations, etc. to maximize how many VP you have so that if someone else chooses to end the game you still stand a chance of winning.

I thought that would be the case but VP victory seems very very hard well maybe for 3 quest wictory. 5 quest adventure could be more stable for VP victory. But I cant rely long games because of disconnections:(

The point is that if a player rushes his/her quest to finish the game and win, and doesn´t do the side quests for that... the other players may still have a chance if they manage to do the side quests, killing monsters etc.
It balances the game enough in order to everybody getting a chance of winning.

Example:

8vp quest no side quest = 8vp
8vp quest (not completed) all side quests completed (3vp+3vp)= 6vp (8 if you are lucky and deal with some foes).

Obviously all this is easier in the 3 quests mode, but also apply in the 1quest mode

Actually if you do *everything*...

His 8VP, plus 3 VP from your completing his support task = 11VP
Your 3+3VP for secondaries, plus 6VP for support = 12VP and a win... more if you clobber certain monsters on the way too.