This is a discussion on Using Donk bet + limping to raise your vpip within the online poker forums, in the Cash Games section; Anyone intentionally skew your vpip and aggression level?
Like limping on the button with 72o. You have no intention to contest the pot, but using 1BB
I think the risk is with half marginal hands you end up playing them. That is where I get into trouble. What was suppose to be an auto fold ends up being a contested hand, that loses 20BB.
I think donk bet seems like a shot on the dark, you waste a chance to see one more action of your oponents wasting the chance to restrict their ranges. I recommend you value donkbet against too much loose passives, when it doesn't reveal your cards. Against all other player styles, I think you have to open check(fold/call/raise).
Sometimes when conciously used, limping may be a good tool to get chips, but think getting chips, not handling your stats. When you were balanced, your stats is going to be ok. Poker is a long term game, so don't worry about that.