Find a solution really interesting question.... I must know when i am free memmber and i am killing gobballs is chance that gob bots will drop to me when i will be slaying gobballs?

Yes, they created f2p (free to play) so that non paying members can egt a feel for the game, you can do everything that a p2p-er can with the exception your not allowed out of Astrub. if you go to community you can check the bestiary for a % for the drop, also if you know other people who want pieces its best to hunt in a party of 6+ for higher prospecting, dont worry about the xp.

Except that F2P has 0 prospecting, so a group of them cannot unlock prospecting caps for drops like linings and capes.