Wrong, wrong and WRONG!! I'm not aware of any contest in which there's a penalty for a contact for which there is not a LOG (entry) from that station. That is, a contest in which the only valid contacts are for stations that "enter" the contest by submitting a log. There CAN be a penalty for claiming a contact with a "unique" call sign -- that is, a call that shows up in only ONE entry log because that may be a call sign that was not copied correctly ("busted"). So for non-participants it's advisable to make at least two (better yet, a half dozen or more) contacts so that call won't be tagged as "unique". Serious contest operators (like me) welcome ALL contacts, whether from other operators who are "in" the contest, or "casual" operators just dropping in to make a few contacts but not submitting a log. They're ALL worth points -- sometimes even multipliers!