Likelihood of finding great domains on domain expiry sites?

I know the answer is more nuanced than a simple 'Yeah, all the time' or 'No, don't bother' but is it worth trawling through hundreds of expired domains in hopes of finding a hidden gem nobody has snatched up - or religiously refreshing an expiry webpage as newly deleted domains are added?

Do all the good ones get taken via alternate methods or am I putting my time to good use by investing in the expired domain search?

-M