The oracle phenomena is relatively new to me. I am a firm believer to have confidence in oneself to do things that are not against my conscience. How one draws the line between when to request advice from Oracle and when to trust in one's own judgement and pray for the best will happen because I have done everything I can to the best of my ability?
There are times where our own judgements has its limits and we can no longer rely on our own judgement, or when we cannot see beyond a certain point. It is during these times that the advice of an oracle is more necessary, especially for long term plans that extend far into the future which is really beyond anyone's ability to judge or to find out.
We do not consult oracles for short term plans and results, neither will we consult oracles for our daily or mundane problems because those problems can be solved with decisive action or just with a little bit more of wisdom and patience. We do not need the help of the divine for petty questions like when are we going to find our partners or whether we should study overseas, for example.
The oracle is for help with long term Dharma related projects such as extending the monastery, whether or not it is feasible to do so and whether or not it is a wise decision in the long run as it is the funds of the sangha that will be used and this money cannot be wasted unnecessarily as it is not just merely a resource but the good wishes and prayers of others as well so to waste or misuse it would incur incredible amounts of negative karma.
For us laypeople, we do not have much reasons to consult an oracle for if we just follow the lama's instruction and go all the way with it as following the Lama's instructions would usually clear off obstacles to our Dharma practice anyway although most of the time it its just a little bit more effort and commitment that is needed. Oracles are usually for the big stuff and not really related with us.