Jerry Puckett, Jerry Kisasonak,
You could definitely set up a buy.domain.com & sell.domain.com, assisting in branding for your company. Like Mr. Puckett mentioned, it would be relatively straightforward having one backend (or cpanel) to work with, and a great idea.
While I am not an expert in either wholesaling or internet marketing, here is my $0.02:
From what I understand, Google (& possibly other search engines) treat different subdomains - for example: sell.example.com & buy.example.com as different websites entirely, in terms of Search Engine Optimization. This will only matter if you are trying to rank high on the search engines for keywords. I will assume for now that you will be targeting your market through mail, flyers, bandit signs, door knocking, and personal networking.
For my hosting, I use HostGator, and am able to have unlimited domains on my account for less than $200 a year. These websites would certainly crash if it had an influx of traffic from major outlets (news sites, etc), but should work for simple websites set up for wholesaling.
Take for instance, how I am going to be setting up my buyers and sellers websites:
For buyers, I will have a website like examplewholesale | com to build my buyers list. It will have a squeeze page, to gather information about their name, number, and email address. From there, I can contact them, find out more about their situation, and add them to my roster of qualified buyers. I am thinking of adding a backend where investors (once signed up), can view property offerings that I have. So in essence, the main site will be just a squeeze page, with a built in login functionality to show properties with photos and information that I have (and can blast out to my email list that I built).
For sellers, I will create a site with a squeeze page as well, although there will be a site built out around it. It will have information on selling their home, and how we can help sell it fast with a quick close. It will be a short email that I can post on bandit signs, a la:
****We Pay Cash For Homes****
*********Quick Close*********
***Call: 888-888-8888 or visit***
*******www | fast sale | com******
This is the way I am foreseeing executing my 2 separate domains, with one being informational as well as collecting buyer information, while the other can collect seller information and disperse deals I have.