$50K for a repaired home in the nicer areas is to much. Having said that what hood is it in? There are million dollar areas of Detroit (The city - not "metro") -and there are several $500K hoods as well - so it all depends on what area...
Assuming it isn't a deal of the centuy and your buying a 500K home for $50K then your paying to much.
$30-35K all day long for beautiful brick homes in the nice parts - repaired.
People who do not know Detroit talk about the rental market or the war zones - most are full of it.
One of the most stable rental markets in the US for the past decase. Homes (mine anyway) rent and re-rent in 2-4 weeks each and every time - never a vacancy longer then that.
$3-4K house CAN be in good areas - heck - I just bought 3 $750 homes and one $1,000 home - including a 2,500 square foot duplex in a GREAT part of the city....
So - while I agree the realtor may be looking for a commission - don't do it - I wouldn't pay over $30-35K for a rehabbed home in the best parts of the city that will rent for $895 - $935 all day long.
Just be careful on the low dollar homes - a lot are being offered on QCD only and your responsible for any taxes / water (today I had a list of 10 homes - $10K and the back water came to $45K) so just be careful.....