Limps are generally weak. Basically what you are asking for is permission to play more hands, invest more money into pots put of position and you will check/folding a ton of these. Yes some people never raise, some people limp monster hands - why?? There isnt an easier way to get your AAs cracked than to limp them, go 5 ways to the flop and then start trying to play them on some weirdly connected board.
In general it's a bad idea. I saw a statement earlier that said "I limp hands that are playable but not quite good enough to raise" - these are called marginal hands and should NOT be limped, they should be folded becausel they are not very strong. By playing them you are burning chips and when you do pair up there's a good chance your kicker is going to be no good.
As a whole, I generally do not limp. It's a weaker strategy and good players will squeeze the hell out of habitual limpers - I am definitely one of those guys lol. If you are limping a ton and folding to most raises, I will start squeezing you until you decide you've had enough.