See what they have compared to yours and what they go for. 

The major benefit is getting a better mortgage rate compared to an investors rate. i would research "house hacking" on this forum and read what others have done executing this strategy.

Get comparable sales within a radios of the lot in question.

A lender brought it up to me that the assessed value is low compared to the agreed purchase price and she wasn't sure it would appraise.

It's substantially cheaper than buying a comparable single family home. 

It looks like it is someone else's turn to gain economic advantage.I sort of get the tiny home movement, but what I don't get is why people would want them given they are generally more expensive than HUD Code homes by the time everything is done.I actually have looked into the containers for several purposes and they always seemed to end up more money than the alternatives.

How much did it cost, and how was the process compared to a standard mortgage?

Those numbers look good on paper compared to your 450K home, but I'm sure my west-side homes offer 3 times the stress!

You need to examine the details of your comparables to determine what the potential ARV is:Are the comparables all in the same city or village Sometimes using the radius for comparison results in spillover from another city or village into the comparables.  

In fact, it's the person you should be trying to pay more.This is the guy who brings you deals or sells your property. 1-2% on a property is nothing compared to how energized your realtor will be for you.So you knock his commission down, do you really think he'll bring you the next deal he sees?