However, I have an exclusive contract with a realtor and I have read that if you have an exclusive contract, even if another realtor puts in an offer on a house, the one you have a contract with has the rights to the commission. 

There will be Realtor members.

My realtor just contacts the different attorneys he deals with (depends on county and type of deal) and they close in about 2 weeks after I sign the contract. 

This can be good, as they may have family or friends who my be interestedThen, you'll get realtors calling saying they have a buyer (usually its a friend they use), but often this can be a round about way of them trying to get in the property and meet you in effort to get you to list with them.Then you will get the people who call...saying, "I'm a cash buyer"   This is usually what comes out of the south end of a north bound bull! 

I’m a Realtor in the Savannah area and my husband and I are also investors.

I was realtor for years, now working in financial advisory so I'm a bit out of the loop. 

Some of the drawbacks are the costs (initial licensure, yearly state and national realtor association dues, and perhaps broker expectations depending on your broker). 

I would suggest working with a good realtor who knows the MF space and can guide you through the process.

Ok so im selling my mom's house and have been in contract with a a realtor for 2 months.

Nathan, for investor-friendly realtors in Lansing, I'd reach out to Dave Hall (https://www.cb-hb.com/daveh) and Dale Huber (http://dshuberproperties.com/about-us/our-team/).