I have a 70's ranch in the Pacific NW without drip edges and now I'm putting them in. Luckily they are very inexpensive (less than $10 for about 20 feet at Home Depot). You can live without them but if you have a mis-hung gutter that jacks up the shingle you WILL have problems. Not good--usually means epoxy and paint if your lucky, wood and partial rebuild if your not. Having grown up in Southern MN I would be worried about ice damning at the gutter and possible water intrusion without the drip edges. Bottomline: I wouldn't reject buying a house without them. Maybe you get the seller to install them as a condition of the sale. Even a spendy pro wouldn't charge more than a few hundred bucks to do it.