What do political parties fear the most?
They fear re-elections the most. An election campaign is worth crores, from government Babu's, to contractors, to small business unions, to big business houses money is sent to party for election campaign.
When they win the elections these same Babu's, businessmen are given favour by the government in form of transfer to good (good here means money making) department, promotions, contracts, bank loans from government loans, tax chori etc etc
The public you see in rallies, the posters you see on the streets, the TV and radio ads you see, social media advertisements etc everything costs a lot and are paid to by above.
Why do you think in absence of full majority parties buys MLA's or tie up with their arch rivals rather than going for re-elections?
It's because in case of re-election, who will give them money? If they collect more money from the above sources, they will have to return more favours, if they take more from others they will have to return favours to more.
The only way to have political parties set good candidates is to hurt them where it pains, their money stream. The only way you can do that is by causing re-election. And the only chance of having a re-election is everyone outrightedly rejects all candidates, then a PIL is filed in SC court and maybe the court will deem the elections void if 80%+ votes are cast to NOTA.
That is the only way you will ever get good candidates, is it possible or practical? Probably not, but unless you strive to achieve the idealistic situation, you won't know.
Modi's ignorance and mismanagement is good for us Pakistanis. lagge raho!