in RtL...

1-Do players get 400 gp for coin pile(4 players game of course) to put in the money pot?

2-Undying ability is a nice effect. Exept when the OL's lucky and get 3-4 surge in a row and players must kill the sorcerer 4-5 times. This way, the game become longer and players and sometime the OL, begin to get annoyed of this rules. Do we play correctly? Should undying ability works only 1 time?

1 - Yes, 400 gold into the party treasury.

2 - You are playing it correctly. If the dice want it to be like that, accept it. There will be times when no Undying monster will come back, and there is also that dreaded Staff of the Grave...