Well you are quite right at the point. I have faced the similar situation. Clients usually consider only the lower bidder and they forget about the quality work. As per my experience lower price is not the solution for this kind of work. There is a min barrier to that a person usually relax in terms of money. If you lower too down then i am afraid the work will be pirated or poor quality.
Secondly, we do need a proper time duration to complete the work.