Actually these scam and trash coins could be very benefitial to YAC's performance. Once people realise that some fancy new coin is probably a fancy new way to scam them serios people will stay away from new coins. Thresholds for new coins are rising quiet fast so already existing coins like YAC have a far better standing against further inovation.
If there is really a new "serious" coin to launch in the future, there are extreme high and inconsistant requirements. It mustn't be pyramidial or too beneficial to early adopters and still get enough promotion to get noticed over trash coins. Technical innovation is a must, but all "safe" new features are already in use so these inovations come with great risk.
YAC might become the only established CPU-only coin, which is a huge advantage. Kudos to FTC,CNC and VAG for keeping new coins out.