Even if they could save 5-10% on that $800 bid, which is $40-$80, if it took more than 1-2 hours they'd be losing money doing it because their time is worth at least $40/hour.In our opinion, it really depends on the level of urgency and the size of the bid.The more urgency, like no hot water, the less time the PMC has to get multiple bids.The bigger the bid, the more likely it is an owner should expect multiple bids.An owner has to be realistic, understand and accept these limitations. 

Shall we get a table for dinner or just go to a bar? 

Sure, but then you’re probably leaving money on the table, and who wants that?

I would use all 3 plus look at properties currently available for rent that are similar to what you are trying to comp (3 bedrooms/2 baths; similar condition; size; etc). 

It is a 6 bedroom and while I see a couple of sales in that 1.6 to 1.8 for 5 or 6 bedroom in that size, that seems to be few and far between.  

This is too important and also sort of a personal question depending on your state and specific circumstance and I suspect not a one size fits all answer would suffice. 

Computers can analyze property based on subjective data (square footage, # of beds/baths, etc.) but cannot calculate for objective data (quality of kitchen cabinets/counters, size of bedrooms and bathrooms, view out the living room window, etc.).You should study the market yourself.

"It's the perfect size for my family of 7, our 3 pitbulls, and our old RV".

But most pricing is a function of recent comps, adjusted for the subject property by size, condition of systems, and aesthetic qualities. 

or in the 700's because most people think they have perfect credit.You also have to know occupancy type like primary, vacation, investment, how many units, LTV/CLTV, Term, Fixed or Variable, Prepay or No prepay, Loan size etc.