I don't think I've ever formally asked somebody to join a band. I rent some warehouse space and hold auditions. The ones that end up in the band are usually not just the best players, but the ones who enjoy hanging around and creating music. ie, they show up eager and ready to work without being pushed.
It's just something that naturally evolves over time.
Same thing goes with working with people over the internet. The ones that immediately start talking about money and percentages and copyrights etc... I don't even wanna talk to em.
I'd rather work with somebody with talent, who's willing and excited about working just for the sake of making music.
And if anybody you work with ever starts using the lame excuse 'I'm really busy right now.....', give em the boot.