is it enough to just put the karmacoins into the wallet to get a share ?
yes. This is why POC was introduced. to give anyone the opportunity to participate in the KarmasharesLLC by simply holding their coins for the minimum period.
One of the great opportunities POC give you is that once you participate in POC, you can cold store your wallet and keep it safe from viruses and other malicious programs that might try to steal your info. Unlike POS system. With POC. you can bury your coins to the ground and claim LLC dividends (in near future) at risk free.
The other one, most important one. It could give you opportunity to vote in your votes for Karma related project and future features implementation. This way we do not have a centralized voting system controlled by only the LLC. If you own Karma coins you should be as important to the community as any LLC share holder.