Bryan and others I can help you understand this more.
When I worked on the residential side I completed thousands of BPO's over the years.
BPO's are completed for many different reasons such as bank bulk sale of regular,non-performing,or a pooled mixture of loans,mortgage insurance drops,insurance damage claim,refinances,short sales,etc.
A BPO can be an exterior bpo whereby a broker or agent is asked to take 1 pic of mailbox,1 of street,and 1 of the subject and give usually 3 actives and 3 solds with pics and occasionally the comps are without pics.
This report usually pays only 30.00 to 65.00 depending on how fast the BPO mill wants it turned in.Usual turn around times are 3 days and rushes are in 24 to 48 hours.
An interior BPO is where you do everything listed above but also go inside of the property at take at least 8 interior pictures including any damage noted.An interior usually pays from 60 to 105 per order.
The reason BPO reports take so long is say I get a bpo interior order for 50.00.The turn around time is 3 days.If everything goes perfect I turn the order in to the BPO mill who then puts through a quality control review. The bank or investor who owns the property wants the report to meet certain guidelines or controls such as comps within a 1/2 mile radius.
In many cases though there might not be recent sales that close unless it is an urban market but many of these bpo's are in suburban to rural markets.
So what usually happens is you go back and forth with QC who is an hourly paid employee for the mill and after putting in a ton of remarks it gets passed.
From there the BPO mill puts everything in a nice little package and send of to their customer.
I will try to make the rest of this post short but can take this much deeper in detail if anyone has interest.
Usually from the time of ordering the BPO it will take a few weeks to get back to the bank.Banks use BPO mills because they do not have the time to locate agents all over the country.Instead they pay a certain amount per order to the mills and the mills pay a reduced fee to the brokers/agent completing them.
There are hundreds of mills out there to work for as a broker/agent and you are an Independant Contractor cutting checks every 2 weeks to a month.
With BPO's you will here these investor guru's touting these strategies that they will work and the BPO can come back in plus or minus ten percent which on a 400k property could be 440k or 360k which could be an 80k swing in value when the bank makes a decision.
The reason you hear off and on information is because of the following.
When the market was hot 5 to 6 years ago banks and mills had to beg brokers/agents to do bpo's.Most brokers and agents were doing many sales and didn't have time for them. sales and comps were easy to find.I could do a 24 hr exterior rush on a new subdivision home sale and get paid 130 to 150 bucks. Report took me 30 to 45 minutes to complete.
Fast forward 5 to 6 years later. Now bpo's are the crack cocaine for struggling broker/agents trying to feed their families.
I know some that make 10k to 14k a month doing volume.Then there are the majority who do say 10 to 20 a week and if they didn't have orders from being click monkeys online they would be out of the business.
You have others such as myself that might do now 4 to 5 orders a month just for kicks.I only do them for long standing clients who will pay me my fee.
Now when we do a report now used to some brokers/agent would send out others to inspect the properties or take pictures.Now many mills have electronic signatures at the end of the bpo's stating you have visited the property,taken the pics,and valued yourself the property at hand.
So when a broker/agent goes to do a interior bpo they might do them full time with thousands a year,they might be a brand new agent who got in with a mill and can be influenced,or they might be an agent in between who knows values but will at least take your papers to see if you are just puffing or have valid properties to consider.
Where many agents mess up is the estimated repairs which can cause the bpo to come in high.Also may agents falsely believe if they value the property high it will foreclose and they will get the listing from the bank.
The departments are separate and have nothing to do with each other.Occasionally an AM will see the agents name on the report and they might pick up business that way.I have seen investors show up at properties and tell the agent if they get the value to come in at XX then they will rehab it and give to the agent when they resell it to make a commission.
Hope this helps