i think of realtors like home inspectors...unless they were in the trade or even building management/maintenance in a past life, don't expect them to really know anything about anything other than what you can learn yourself watching HGTV. they can fill in forms, add amendments or suggest things that are general rules of thumb at best. and tell you things about areas/market that you should already know yourself when house hunting.
nothing wrong with a realtor mark. doesn't change a new build's price either way afaik. at least they can review the documents and talk to you vs in house sales people that are probably even more shady than a licensed realtor
