I'd like to say it doesn't matter but after purchasing a few lenses with 'some cleaning marks', I'm unlikely to do so again in the future. Both were so significant that the loss of contrast and the amount of glow dominated anything else in the picture.
A few shots here: http://www.flickr.com/search/?q=indu...59657594%40N00
I don't mind risking $20-40 a pop for FSU lenses but I wouldn't put down much more than that on a risk. One of these days I'll find an Industar 22 or 50 with a front element in decent condition.