well, i LIKE to see peoples instruments and grades in their signatures, when the posts get off the topic i was interested in i have something else to read...
i'm joking, but it is nice to see so many people doing well. to be honest i don't read sigs all that often, but its nice to have an idea of what the person you're talking to is doing music-wise, especially if you've asked a question. they only annoy me if they take up more space than the average post buts thats because i'm lazy and loathe to scroll
boastfulness comes out in attitudes in posts not sigs. my pet hate is the whiners who post topics on how badly they think they've done merely to get others to tell them how good they are, "oh i think i might only get a pass in my grade 8 piano" etc. always gives me an eye rolling moment (unless they have serious worries of course...)
at the end of the day, how impressive i find a persons grade AND/OR marks depends on the individual. though i don't have many myself so i'm easily impressed
today seems to be my day for long posts