At the end of the day vet these lead gen sites/companies on a short-term basis, then flip to something else if the leads are not working while having the right expectations.

Links to your three other posts on this same topic so readers can see what's already been discussed:https://www.biggerpockets.com/forums/61/topics/551577-backyard-homes-produced-in-chinahttps://www.biggerpockets.com/forums/617/topics/551580-china-built-backyard-homes-socalhttps://www.biggerpockets.com/forums/61/topics/537480-tiny-homes-produced-in-chinaThis sort of house is an interest of mine, though I'm more interested in building them on-site with a 3D printer and local materials.  

List subscriptionIf you search the BP site, you will find alot of information on each subject.What you CAN NOT do is tell someone, "Hey I'll give you $1,000 if I end up buying the house"Feel free to msg me anytime.Keep in mind I am not an attorney, and this is not legal advice.

I would like to know which sites are reliable to do some market research on population growth, and income on zipcodes, and counties in Delaware.

Steel site.

I've butted heads with mods over various topics, to include what should/shouldn't be allowed on the site.

We take it a step further and build in factory then deliver the units to the site.

You're not on site or within driving distance and even with a property manager, lots of things can happen. 

So, those 13 clients weren't impressed enough (or reminded) to write a review on the most public buyer site out there.And no, they are not all this year.

Don’t leave anything to chance—guide the visitor to do what you want, which is to click YOUR ad and leave their details on YOUR SITE.