FYI - westlaw and the A2nd don't exactly
point to local real estate liscensing rules.
For future reference, here's two sources of state laws that'll be helpful if you ever want to look up stuff:
Your condensending "know it all" attitude
tells me you really must be a lawyer.
I'll take "know it all" as a compliment but calling me a lawyer, that's a low blow.
Anyway, here's a link to the DE real estate broker/salesperson statute:
I call your attention to Section 2906 - Certificate requirement.
"(a) No person, partnership, association or corporation shall act as a real estate broker or real estate salesperson, or advertise or assume to act as such real estate broker or real estate salesperson without being registered and without a certificate of registration issued by the Commission."
So, without a certificate, you would not be able to collect any part of a sales commission.
You can certainly represent yourself in the transaction. But you would be your own attorney not the seller's attorney so you would not be entitled to collect any fees from the seller.