Brokers do have the option of hiring whomever they want for certain work. Usually as long as it is not trash-outs, grass cuts or maids they have fewer restrictions.
For me it is simple. If the broker asks for a bid I give it to them. There is no my property your property crap. This same guy will bid you right out the door on one of "your" properties in a second.
If the broker wants a bid it is probably because the regional or national the other guy works for has jacked his bid out the roof and he wants a competitive bid.
My experience has been that my bids are marked up about 40% to 60% by nationals or regionals so I end up with very little bid work approved through them.
I usually have to wait 45 to 90 days to get paid for direct work, so for brokers I bump it up about 25%. Call it a finance charge if you will. Even with that it will normally come in as low bid and get you the work.
We have more and more brokers hiring direct for evictions, repairs and even some debris removal because it gets done faster and by who they want to do it.
A word of advice, ask the broker if there is an upper limit to the amount you can charge without being a SAM vendor. I had a broker take me aside and tell me that as long as my bids do not exceed $500 they will get approved alot easier and will not require a competitive bid from a SAM vendor. I do alot of $400 to $475 work for him.