depending on kms and rust $650-900 id say, lots of the little stuff you end up throwing out and diving boards (bumpers) you really don't see anything from
parting e30s makes sense if you own one and want cheap source of parts - but profit is not there and like said before you throw out 50% of the car
ask me how I know - i have 2 e30s on my driveway :-)
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1984 318i w/M10 - restomod in progress :-)
1984 325e - in car heaven now :-(
1991 325i - project / parts car 2005 325i executive edition - daily driver :-) http://www.cardomain.com/ride/2831989