And Most importantly we are cheating ourselves. it might very well be Halachically OK, but something that if you ask a Rav, he might say, its halachically OK, but I wouldnt do it because it looks shady. Gedolim never engage in things that might be OK, but look bad
When we do things that even look shady even if they arent, we are damaging our Neshamas and we WILL cross the line from things that look shady , to things that really are shady