It's easy:
1. Stealthing isn't tapping into the band's private conversations with each other.
2. The band has a very generous taping policy, with very few restrictions. Ignoring those restrictions is a slap in the face to a band who has been very generous to the trading/taping community.
3. In the past, the presence of IEM tapers at DMB shows have caused legitimate AUD tapers to have their bags searched and, on occasion, there equipment messed with. It also almost caused the band to disallow taping entirely.