Questions about black hat se0

1) Do you think black hat seo still works for business?

2) How has black hat evolved since latest g00gle updates?

3) If a seo company ranks for thousands of dollars on serps using link networks do you think that means they know what they are doing?

4) Do you think on some level g00gle might accept black hat, but when it's done on a level of quality? (In other words - black hat that people with more money and higher quality sites can pull over)

Thanks