ignore them, you waste your time. Stickies (SGA only), Same with pub. access, random example for teh banhappy nubs
10% up to 50% black ss are normal (and have always been since there is a PunkBuster, i still have a 100% clean rctw-linux+Ati client...) depends on: game & serverside pbss-settings & client-server connection quality & ... various reasons, pointless to ask/wonder/guess really which, positive proof for a hack is the keyword. To reduce the black rate try to tweak your pb_sv ss settings HowTo, rule of thumb: less is more, best chance to get maximum black ss is to request as much as possible ;p
pbss are overrated, less than 10% bans in most games, and don't forget hacking into pb will return global bans ... with 5ct patience