you also think it's ok to use GSA to build tier1 as long as done selectively, carefully & slowly?
I want to find niche-specific sites ... any idea where to buy or how to scrape?
Using GSA SER for niche specific is just a waste. In fact, it really doesn't make sense to use GSA, particularly for niche-specific sites, because GSA will be looking for CMS's footprints, and you can't be confident that you are going to build links only on a niche specific site. In other words, you are going to lose a lot of time and resources as well.
Having said that, I wonder why you have a real concern for automation of niche-specific link building, especially for web 2.0s. Today, it is tough to get indexed by many Web 2.0s. GSA has a specialty in tiered link building, which allows you to create your own tiered link building nicely and after you're done with creating a decent list of accounts, it save resources even on future runs. (captchas / emails )
There are bunch quality link list providers. although there is an overlap in each service, I always end up with more uniqueness, and it is worth the money.
I only use link lists from the marketplace and sometimes hrefer lists,
As I don't want to overkill the process on my link building i stick to posting not to scraping and filtering.
instead of trying to scraping niche related targets , you might want to target good, related content to feed GSA. (optimizing your content generator with proper anchor text rations etc ) I've found that SEO content machine is great for that. Combining SEOCM with GSA SER is a lifesaver.
Iike i said i am not a scraping specialist as i don't have time and money for those. But with Scrapebox , Google passed proxies , Automator for scrapebox and GSA PI with domdetailer credits you can build your own link list. used to scrape from hrefer , gscraper , scrapebox before there is a market for premium services damn those days lol.
now time is money for me..it all depends on how speed you can earn money ...cause real currency is time not money