Searching for roommates on Craigslist is kinda like that. So many "Please help!" postings...it's absurd. No, I'm not going to give you a bedroom in exchange for housework.
Excellent decision. Every single time I've accepted a deal from a tenant that involved bartered labor in lieu of partial rent, or full rent, after the first month they simply stop doing the labor. Every. Single. Time.
It's not even that they don't have money for rent. They generally do, but they're spending it to treat a new romantic partner, or to practice an addiction, or to buy more McStuff. What they want, is to take from you in order to give to the people or activities that are important to them.
The barter tenants I've had in the past have given me attitude and treated me disrespectfully in ways my paying tenants never did. Since money isn't changing hands, in their mind it isn't a business transaction and they don't have to hold up their end of a deal, because they've got some other kind of connection with me that doesn't involve them holding up their half of an agreement or maintaining reasonable boundaries. I think at some level they decide they're "friends" with me instead of parties to a business relationship.
On the whole, people genuinely do not appreciate services they aren't paying for.
The person begging for "help" on Facebook or Craig's List may indeed be in need, but it's because they've already burned through all their friends, co-workers, family members, and other people who were well-meaning but dumb enough to sign up to carry them. Should you choose to accept the assignment they're offering, you'll become the latest in a very long line of do-gooders who have queued up for the privilege of serving them. First they'll slack off and not hold up their end of the deal. Then they'll mooch food, or utilities, or something else. Eventually they may graduate to outright theft or sexual harassment, because they'll decide that you're not their landlord but their buddy, friend, or bedmate wanna-be. Their sense of entitlement will be impossible to reality-check away, because since they've been mooching off others for years their belief in their inherent worth and entitlement will have a solid basis in fact.