If your ideas don't require all that much money then they are easy and obvious. Again, if the "barrier to entry" (to such ideas) is that low then that's not a sustainable business model. Unless. You are confident your "competition" isn't really trying to compete either.

Sustainable means to stay in business. If you're not trying to fend off competition; if you're not trying to grow/expand; then you are waiting to die. Death =/= sustainable.