What Google does not like is blatant link manipulation.
If you're looking to buy links and scale - don't do it. Better to build a good website and know the sorts of folks that have the capacity and would want to link to your site if you marketed to them.
Google disregards a lot of bad links , but you risk getting a penalty even if you do, as Google wants to send a clear message to dissuade spam linking practices. The number of Penguin casualties should be a lesson for anyone thinking of playing this game. What Google seems to be doing is wanting an admission of guilt via the disavow tool for previous offenders and future abstinence from this behaviour.