Until recently, the only programs available for alcoholics and addicts were AA and NA. Because of this, it makes sense that the majority of folks at SR work the twelve steps.
Also, remember that part of their program teaches that one must work a program to get and stay clean. Although we might not agree with their opinions, they are trying to help us get and remain clean and sober.
Hopefully as SMART, LifeRing/SOS, and other secular programs continue to grow we will see more folks speaking about their ESH (Experience, Strength and Hope) with these programs to new members.