Are GSA SER blasts acceptable for Tier 2 links?

I thought you did not go to GSA SER until Tier 3. I suppose it depends on how well the person knows how to use GSA and the settings they use.

In general, are things like Web 2.0, pdf, social bookmarking, maybe some web 2.0 profiles, articles, wiki articles, and things like this alright to put on Tier 2?

My Tier 1 links are going to be fine but I don't want to mess things up by throwing a bunch of garbage at Tier 1, I also don't want to pay between 0.07 and 0.10 per link for links with DA…

Are GSA SER blasts acceptable for Tier 2 links?