It's a zero-sum game. If wealth is coalescing around her, that's less money other people (namely, her tenants and the people whose bones she picked to get her craigslist stock) have. Given that maintenance services would be a necessity regardless of who owns her house[s], she won't be creating any jobs any time soon.
There's no nobility in becoming the middle-man, you're simply taking a cut for yourself under the guise of providing a nominal service. Landlords largely take money from people who don't have the money to shelter themselves in the first place and, for their... $700/month, those tenants get marginally reduced responsibilities over the property, the threat of being kicked out (and having any of their property that they can't move nicked and sold on craigslist), and the knowledge that they've got $700 less a month to put towards a home of their own.
It's rather sad how eager people are to lump praise upon a young person for being opportunistic and greedy.