Wow 1-300 deals thats horrible! I would suggest attracting better wholesalers to your business, those are the best deals you can buy right now.
However, you have newbies that will cross your path sometimes that don't know how to calculate APV, repairs, or just don't have the resources.. but i think as a good investor it maybe in your best interest to point those newbies towards your target areas along with a price range for each.
Good Investors have Good wholesalers, wholesalers always send deals to their top buyers first and maybe at a little cheaper rate then their other buyers, at least I do.
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The only way I see a wholesaler should be marketing another's property is if their is a option or a relationship built their. This doesn't mean to jack the price up 5k, unless you can find hidden value in the property the original wholesaler did not see, for instance you have wholesalers that never go out to look at a property they make offers directly from street views and public records and they get the deal. A couple months back, a wholesaler sent me a deal that was listed as a 2/2 but in fact was a 3/2 just a error in public records, by me spending the time to go look i was able to sell this property to one of my buyers 7k over the orginal price and have the wholesale discount it by 3k. So i made a total of 10k, assigning my contract on this property to a buyer that turned it down from the original wholesaler because his marketing noted this to be a 2/2.
By the way the wholesaler only made $500.