My younger son just recently got into R/C cars. Personally, I have no interest except where he is concerned. For that reason, I have been scanning the R/C Cars section For Sale forum over the past few days. It seems like I keep looking at the same ads every morning because the posters use "bump" to "ttt" to bump their ads. This seems to be accepted practice. It is very common in this particular section. Why is it accepted practice in this section but is frowned on in all the other sections?