Not buying it is probably the best bet, but don't forget that it can work. If your not asking the girls out then you can never really expect to get married, no? Money should be of no concern IMO, being that this an expensive hobby to begin with. If it's not this it's that. It's always nice to hear a success story as opposed to a horror flick though. (even if it's not ideal) GL.
While things might work, when you try to break generally accepted requirements, you chances of success drop very fast. It's real easy to end up with a tank of very dead livestock.
If your trying to keep a very difficult fish, and you have done your homework, and have a very specific plan on how your going to try and maintain it, that's one thing. If your just taking a fish and adding it to your tank, and thinking, I'll just see how it does, you are doing yourself a disservice.
As for "Money should be of no concern" I completely disagree. While the hobby is expensive, there is no reason to make it more expensive, especially when your adding fish that have a small chance of long term success. When you do this, you have spent the money and have nothing to show for your efforts and money. Now think how much different things are if you get something that will do well in your system. You'll have it many years, and have something to show off to people.