I would not.
To much hassle. You need to keep niche for every of them.
Maybe some of them that have good names...
I have the opportunity to pick up a mixed bunch of PR3 domains for about $20 each.
The domains have mixed backlink profiles. Some will stay PR3, some will experience PR drops. With effort, I can probably spot which domains will keep their PR and buy only those domains.
Do you think it's worth it? Should I go to all of that trouble for PR3 domains?
PR3 names can be picked for $12-$13 at Tdnam, and sometimes you can even get PR4's for that price.
I'm not sure it's worth the hassle to spend a long time managing those PR3's.
Only if the niche of the domain is similar with your interest.
The thing is if they are in good niche you can go on buying them..otherwise its a waste of money..because rare niche domain can be easily created and shown in PR3 so check and continue buying..