Making offers without inspecting properties

[Joe Melvin]

I've recently started marketing for properties and received a good response. However the sellers aren't interested in setting up a time for me to inspect the property. They just want an offer. I did do a drive by on a few but this says more about neighborhoods than specific houses and their rehab needs. I have sent some LOI's to sellers based on the drive by and a worst case scenario estimate for rehab. This obviously resulted in very low offers that were not well received.

So my questions are. What am I missing? Should offers be based on best case and then adjusted down? Are these leads not the type of leads needed for the buyers I currently have? 

Thanks, Joe