I understand, but I think the idea is that, for some people, you are losing out on potential earnings if you're leaving it up to a gamble. If you're catching wallstreets consistently that's great, but other people might find pandaing a handful of surveys while they step out more lucrative (or, like i said, zings if they are going back and forth between things)
edit: hmm I kind of contradicted myself here. the tl;dr is probably: gamble for 80c vs gamble with a higher limit and that zings are easy and mindless. Also, effort is relative