and then, what to prove, what to gain with RC5-72? Its not even some secret stuff which may be interesting! I mean... if it would be the X-Files or whatever... yeah, why not? But they proved that RC5-64 is quite secure... RC5-72 is even more secure. So what? If you want it safe... go for RC5-256 or whatever... it would gonna take a while till someone has enough power to crack that. Ok... stats whores like RC5-72... but aren't there other projects with cool stats too? I kinda like my F@H stats.
Of course, if you like to use RC5-72, why not. But I don't see any sense in doing that.