How many times do you submit a poem for publication / competitions before finally putting it out for pasture?
Personally, if I really like it, I might give it three goes. Usually, after that, I've written more anyway and I usually think my newer stuff is better (whether it is or not is debatable) so I let it go and graze freely on my C Drive.
But if I really really like a poem, should I stick with it, through thick and thin, until some editor / judge sees the brilliance of my work? When is it time to say 'enough is enough'?