I hate trials. If a surfer is into a site and is willing to whip out the CC then they shouldn't have a problem with 30 bucks.
Also, after 30 days they are WAY more likely to forget to cancel.
Some shitty sites do better with a trial but a Hot site that converts awesome will always do better for a webmaster without trials.
1 29.95 signup is worth the same as 10 2.95 signups and if the site is even half way shitty you will lose 7 of those rebills so what's the logic in that.
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Make $$$ the Diabolical Way