I've done a bit of research into this and have come to the understanding that this is a game that can't be "beaten" in the long run (although this is mostly conjecture from random posters on forums as opposed to say, an article about it on WSJ). If it is, it requires a ton of studying and knowledge, and probably not worth it as an endeavor overall. As a professional poker player myself it's also obvious to me that any site offering this structure probably has an inherent edge over the player (in the same way the casino has an edge over players in blackjack). I think my dad is up money so far, but I have a hard time convincing him that it may be just shortterm variance and that his bets are likely losing propositions in the longrun.
If anyone has a simple, pragmatic way of convincing him to stop playing I'd greatly appreciate it. He used to be a lawyer and has followed stocks for years, and he tells me that there are logical patterns in the stock charts which to me just sounds very past-results oriented. I've told him on many occasions to just trust me and to stop, but now I understand this must be what he felt when I first told him I was playing poker online lol, so I think without some effective way of convincing him, my words don't have much weight.