Mark makes a very good point. What I can do with the money does not mean that someone else could do the same thing. But if you are strating from ground zero, and having to learn, transactional funding would be pretty simple.
Keep in mind that;
The transaction to be funded has had title insurance issued for the B-C transaction and good title has already been assumed.
Knowing that the b-c is sold for more than the a-b means you don't need any market analysis of the collateral.
The fact that the b-c funding is there at the closing table means there is no credit issue.
Knowing that the closing agent is insured means they are responsible for and will pay for any loss arising from mistakes in the settlement or the documents.
Other than being robbed in the middle of the transaction, I don't see any risk.
All the investor needs to know is how to check that these matters are correct and the closing agent can make assurances that the deal is closing. So, just get to know the closing agent and title company.
500 K would be a full time business. Expenses would be in the advertising your services and making yourself know to Realtors, Banks and Closing Agents.
In many instances, the usury limit imposed by state law will restrict your rate. In my state it's 10%. I will let you figure out what your annualized yield would be on 50K at 10% for one day.
But I have to admit that your money will not be turning or working 365 days, but at 30 days, that's 300%!
So, the trick would be having 100 deals at 50K. every 30 days. That's alot of business!
You would be considered a lender, you would need to get a license, which means an office and telephone. You would need to store loan packages and keep them on file (could be in a storage building).
The question would be is there enough business to be had for your activity? If you had a list of 200 investors that actually did deals regularly and you set up the infrustructure with closing agents, then yes, you could keep your money busy. To set it up, it would probably take me a month to get it going, it might talke someone else a year.
But having done most everything at one time or another, I can tell you the easy money and the most profitable is in lending, not in painting, driving nails, collecting rents or doing quick flips. But they all make money and bottom line, as Mark mentioned, you should do what you are suited for, what makes you smile everyday.
Who knows, you might make more buying and selling oil futures! But profit to risk, transactional funding has got to be the easiest dollar to legally steal with the least amount of risk, knowledge and effort, per dollar in the pocket associated with real estate. IMO