Comment Posting to Index Forum Links - EXPERIMENT

Currently, just purchased a high PR forum series of backlinks (supposed to be pr4-pr9, domain rank).

The problem I've had with forum profile links - is that they rarely get naturally indexed.

This group of links, one month old, just got run through Scrapebox's Google Index check - here's where we're at.

526 forum link pages
150 indexed
376 not indexed

By the way, this is pretty amazing just in and of itself. A great indexing rate!

But, not good enough for me.

I'm going to run the non-indexed links through Scrapebox's comment poster, with private proxies, and a new post list just bought yesterday.

This way, I'm building backlinks (comments) to my forum links.

I'm still sort of new to backlink-building, but I've yet to read other people talk of this sort of technique. There are tons of ways to build backlinks to backlinks, but I haven't seen others talk about comments -> forum links for indexing.

It will be tough to gauge the actual effect on the SERPs, because I'm also doing normal comment posting, other forum profiling, article submissions, etc. to my money site.

But, I can at least start indexing all these non-indexed forum links.

I have about 10k forum links to try, after these 376.

Anyone ever done this? I'm certainly not the first. Just curious if it's common practice.

If this works well, I'll start offering it as a service to index forum profiles.