that isnt an advantage.

Think about it this way. If everytime someone puts in a 6BB raise your computer automatically calls 5BB of it for you then you only have to call 1BB left of the raise if you want to continue with the hand.
Are you getting better odds? sure
Are you going to lose shedloads of $$$ folding on the flop? You bet.

If you have a decent hand like 78s then you are getting better odds to call but if you have a crappy hand like 23o then you are being forced to call half of it anyway and then fold without even seeing a flop.
Id rather have odds made of lots of opponents limping than me force limping.