If the market rent is $1,100 a month, you'll be out one to two thousand dollars, plus the cost of repairs, painting etc.

The real issue: had this been known to me, I likely would not have closed (this wasn't the only issue with the place), at least without reduction of price or final say of damage repair quality. 

You are only setting aside $110 a month for repairs, if you have to replace a frig, this can wipe out a whole year of this.

Telling them my husband was extremely allergic to cats and would not be able to enter the unit for repairs or maintenance seemed to finally get through to them that I really wasn't going to give them an application.      

Any tips or advice on how to come up with a solid ARV, and any other tips on getting started off wholesaling in general would be appreciated as well (determining repairs, etc.)

You just haven't gone to Kinko's to make it pretty and you might not have done graphs, which I do because I like to see stuff visually.You will also need to buy it with an assement, and if the bank asks it (which it almost always will) make repairs and etcetera to secure their investment.They also might make you get some types of insurance, hold stuff in escrow.

. ($50k meaning all in price after repairs). 

Try negotiating the offer price to reflect the repair cost of the sewer line.

This is obviously a little simplistic as it doesn't account for utilities, repairs or capEx.But look at it this way: you have to pay to live somewhere. 

You save money by financing subject to repairs.