Firstly, it depends in large part on what the domains specifically are.
With that said, if you've been getting unsolicited real offers (not the bogus spam nonsense) on them for reasonable amounts, then I'd say definitely keep them; wait it out.
However, if you've received few to no decent offers then selling now may be worth a try if you need cash now / don't want to keep paying the renewal fees.
In making a decision, also consider the amount and quality of the traffic, which likely varies widely for the 5Ls you have. Also google them (web, images, news, etc; search them all) and see if there are similar named sites / people using the 5L phrase.
And run them through estibot and/or one of the other various free appraisal services - don't put too much emphasis on the apprasal value itself, but rather look at the value differences, related keywords, occurrance rates, etc between the various 5Ls and other domains you have to better determine what is worth holding longterm verses selling now.
It's a gamble of sorts for each domain one wishes to sell ... is it better to hold on and pay renewals year after year? (which can be considerable for large portfolios) -or-sell now? Even seemingly crappy domains that get few to zero offers suddenly sell for huge amounts of money out of the blue - check out Sedo's recently sold listing shown in the lower right-hand corner ... it's amazing what some domains sell for; are worth what someone else is willing to pay.
In short, there's no one simple answer, but hope this insight helps.
Ron