Uhm, what? That's literally all they do in the Western Cape. Fransman and Ehrenreich etc.
They've grown remarkably. Look at their performance:
Year - votes - percentage of vote - seats in NA.
1994 338,426 1.73% 7
1999 1,527,337 9.56% 38
2004 1,931,201 12.37% 50
2009 2,945,829 16.66% 67
2014 4,091,584 22.23% 89
They've been the official opposition since '99. No other opposition party has managed to actually get themselves off the ground and make a significant impact other than them.
And what do they have to do differently? JStrike also couldn't manage an answer.
They develop sound, reasonable and practical policies. They're strong where they're in opposition, doing their best to keep the ruling party on their toes. They develop strong, capable leaders across the racial board. They govern well where they govern. They then campaign on this and we're told they're doing it wrong. This is how a mature, proper party approaches politics.
Should they abandon all of this and go the ANC route? Lie to people, make false promises, blackmail them with grants and RDP houses, blatantly lie about your opposition etc?