link juice.. dilution...

i read a lot about PBN and link juice..

Something i cannot find the answer to..

Does multiple links to different sites really dilute the link juice and effectiveness of that pbn site?
if so how do these pbn services operate? they've got loads and loads of different links made to different clients websites.. surely they are just diluting their effectiveness to various sites.

what is the best option

pbn with 1 backlink to my moneysite.. looks a bit dodgy but with 100% link juice
pbn with a few backlinks to various sites including my own.. looks natural but diluted link juice to my site.

pbn with a few posts, links to authority sites, your link thrown in there. Works for me. Both methods work.

I usually go with 3-4 external links (to my sites) on each PBN post.