@Brian Garrett Realtors should set up a search for you based on criteria such as list price, number of bedrooms and bathrooms, square footage, single or multi family, etc. etc. That should be basic enough for any realtor to do. Is this what you're referring to? Or are you expecting them to run an analysis on the property and tell you "buy this one it will give you a xx% return." In my opinion even if the realtor did provide this feedback you'd be a fool to follow it without really scrutinizing how they arrived there.
Regarding sales comps, they should be able to give you some help with that, but keep in mind they have other clients so maybe they want you to trim that list of 67 down to the ones you have real interest in before doing so. If you don't want to look at that many listings why do you expect that they will?
For rent comps, they can pull mls data on that as well, though that tends to be more limited. Depending on the market Craigslist, Hotpads, Zillow, etc. can be the best place to look to compare rental amounts.