My feelings on gopickitupformebro:
Offering one - VERY cool. That sort of selflessness is what pushes a community forward.
Asking a friend or trading partner - Cool. A relationship has been forged and they know you'll return the favor.
Soliciting people who don't know you on a forum - You sound like an annoying old hippie. "Heyyyyy maaaaaannn. While you're there anyway, here's my grocery list. I know you're putting forth all the effort, but I can't even be bothered to tell you specifically how I plan to compensate/thank you. Just have faith I'll do you a solid broooooo. This community is all about looking out for each other and naturally that starts with YOU looking out for ME." Take it to ISO:FT like everyone else, deadbeat.