I'm not saying to not negotiate. I was mistaken when i posted about roofstock deals being nonegotiable. The actual way they do it is you can make a bid below asking and wait for a counter or acceptance. But the property will still be open to others. If you make a full price offer and complete their "checkout" then they take it off the market. For some reason i thought i read something about not being able to bid on certain deals, i must be mistaken or they might have changed thier format (but more likely I was the one to make the mistake.)
I would defienlty negotiate with any deal be it wholesale, turnkey, ro traditional purchase. off the bat Roofstock charges certain fees to use there services, so that alone ups the inital numbers as well as PM and any fixes that the property might need.
The reason i like to browse through them is becasue they are a turnkey provider. They have a lot of data that is neatly packaged up for people to look at. But as you know when you start to run your own numbers at a a more conservative rate, their numbers start to look a little inflated. But it does give newbies and people not familiar with those areas a stepping stone to see if they are going in the right direction. What i like to do is analyze a few from the TK provider, then go onto other sites to see the market for similarly sized homes in the same neighborhoods. then compare the numbers and compare. Hope this helps and clarifies a little.