"How do i get in their circle without Proof of Funds?"
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You can't. As other posters have said, you have to close deals. So you have to either have proof of funds, or proof of influence over those who have funds. You bring the people in your circle (those with funds), to the broker.
Otherwise you are just wasting the broker's time, and he doesn't need that. So IF you have people you can deliver, then find out from them what their criteria are for deals, figure out their financial wherewithal, and then go to brokers and say "I have X type of buyers who are interested in Y type of deals. Do you have any such deals?"
The broker will try to learn the identity of the buyers so he can cut you out. You say no, as your buyers are depending on you to screen the deals for them. If the broker persists in not telling you about deals meeting your announced criteria, move on to the next broker.
As other posters have said, however, then you HAVE to close. Otherwise you will be written off as a time waster. So don't look for super deals and then try to flog them on. Look for super investors and cater to their needs as a screener. THEN the brokers will start coming around.