With a nice butter'd scone ;-) - I'm on the fence about this one. Scansion wars definitely suck, but although there are a lot of opinions about what makes a good limerick, that doesn't mean there is no convergence, and that all conventions can safely be ignored. IMO, a good limerick is a successful interplay between form, coherence and humour - it's not necessary for all to be perfect and sometimes the one or the other takes precedence, but if all three are weak, why bother? And while it's true players can just look the other way for a while if the quality descends below their personal threshold, sometimes that means witty people don't bother to post any more and the enjoyment of the whole community can degrade a bit.
Definitely with Porojoy on this one, as I've often found myself substituting a less witty line for one that remotely scans, or even (horrors!) moving on without posting, which some seem loathe to do. Oh, and Rosie's point on "Spotty Herberts" is superb! But the nurses all say I'll be fine