does that mean you need to have 100K token to have a masternode?
Yes
That's a pretty steep price, even with the significantly reduced rates -- for a retail investor, that is.
Right, I don't think the price was designed with retail investor in mind though. Stu mentioned in the chat they pretty much want investors that are in it for the long haul, and not the investor that could hop in and out. I think the idea was the commercial investor.
Does it work in a similar way to Lisk, were you have to have a large amount of coins to forge/stake but you can earn rewards by holding coins and voting for delegates from you wallet?
I highly doubt this, because for the Lisk delegate the amount of coins they hodl doesn't really effect whether they can run a node or not. Each Lisk is a vote so sure it helps if they own alot themselves, but it's not mandatory if you can get alot of other people to vote for you in one way shape or form.
With this, you either have the 100k shares or you don't, and if you don't have it you won't be running a masternode.
Aside from that, I'm relatively new to Lamden. There's no mention of delagates or DPOS in the whitepaper, but Stu did mention delegates/witnesses once while talking about masternodes so I'm not sure if delegates/witnesses are a thing or not.