I see a lot of the comment's and I specifically agree with Hanzo, "Disavowing is a double edge sword". However in my opinion we also come up to the point : "if its not having negative effects why do anything".
My response to the latter question is why would you want to give them room to do anything? As unfortunate as it sounds, Those blog links suck. But I guarantee you can make better links than those blog links, even if they are other blog links on strict DR/PR restrictions. What I would do is decide a method : Am I paying my PBN guy extra, or am I crunching some hours to 1) make my own PBN, 2) Generate my own highly targeted site list to blog comment/ profile link , 3) am I doing a massive PR campaign to highly reputable prospects (and slowly disavowing in handfuls per quality link), or 4) am I using a handful if HIGH QUALITY parasites, to make the difference?
In my opinion I would focus on 2,3,4.
If you don't like the links they are throwing at you ~ easy , make better ones slowly drop the old ones.
If you want to increase your metrics : Cool, go 3 or 4, PR's go along way on other blogs be it guest post, be it a standard article they wrote, doesn't matter. That article will last for 2k of those spam links easy. Remove a handful at a time.
Now if you want to remove the bad links, and replace them with potentially page 1 parasites, that in my opinion is the better option. If you do your parasite right, you can gain a ton of traffic in 30-90 days, and remove the old links and come out better than ever.
Cheers,
Rocket
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P.S : Do not remove them all at once, if they gave you 10k bad ones, get some good ones remove 5-10% of the bad, wait to see results good or bad. If good continue, if bad, try to determine why and make the appropriate changes.
I think True and myself can agree, if you do remove them never do in bulk, go slow, wait to see results and adjust..