I would say you are, heh, but because of the age, they are very cheap nowadays. You can get the 10th anniversary edition (MYST, Riven, Exile), which is what I have, for like 20 bucks. That's not much for three games and hours, days, months, maybe even years of entertainment. I know I've been playing Riven for about three to four years and still haven't beaten it. They are pretty awesome and I would recommend them to anyone.
I have all the Myst games as well. I think Riven is the hardest of the bunch (yes, I had to Google to finally finish it after owning and playing it for years before I had the Net). Of the rest, I think I had to just get a few hints here and there to complete the others.
Myst Online : URU Live is up and running! >> http://mystonline.com/en/
It's now FREE to sign up, download and play to your heart's content.
It is multi-player but except for player added ages, the bulk of the game can be played alone. But that does not mean you don't have to go it alone. You can invite others to share your ages (and visa-versa).
I've already signed up and played a few hours yesterday, my IGN (in game name) is Draceena (natch) so if you do sign up and get your KI you can add me to your friends list.