The thing you mentioned at the end is exactly what greed is all about. When destiny is giving you the opportunity to get $200 which you can get immediately but you become greedy and wants to get $1,200 that only is a possibility and you might not even get it, you will even lose the $200 that you could get and might not get $1,200 as well.
Yeah, another one could be taking useless risks. I remember so many times when I make huge parlays I end up losing with just one game. If you end up betting on 9 games, and win 8 of them, and because of that one loss you end up losing all your money, that's greed for sure but that's also taking a risk you shouldn't have as well.
If I wagered on all those games one by one, I would have made a lot less money, and I mean like seriously little amount of money, but at least I would had some chance, and that's what matters. That is why I try to keep the parlay to a minimum, except when I have some profits I want to burn through and have some fun with, in that case it becomes a little bit more money that I can risk and that's when I do parlay.