Let's face it.
Finding partners is like a sale in the store. Usually, the better ones are taken first, and the leftovers are left to the rest.
Assuming that some people:
1. have high standards, ergo such individual is probably "occupied".
2. feel that somebody else's partner is more appropriate for him/her,
wouldn't it be more prudent to woo/sulot the subject from his/her existing partner?
There are a lot of social/evolutionary hindrances to this kind of activity but the reality is, the good ones are usually taken first.
Are we content to feast on the leftovers?
Do we wait for them to become "unoccupied"?
I'd just like to hear what people here have to say.