Blasting back-links would really only apply to Tier 3s...
It's okay to point it to Tier 2 links because those are less valuable and don't matter as much if you lost them. Many times, it wouldn't even be checked so it would pass on the link juice towards your money site. However, it's entirely possible it will be checked, and then you lose your Tier 2s. Not really that deal since these are cheaper and can be afforded to lose if really necessary. The pros out-weigh the cons here. However, it is not recommended to point to your Tier 1s since these are your more expensive, quality links and these you definitely don't want to lose. These should be treated as your money site.