Thanks for your input! I think I can tell you why you don't get curation rewards (directly) for some posts on 3speak:

They seem to be experimenting with the curation logic. The setting allow_curation_rewards is disabled for those posts, so that all rewards go to the author, which is the beneficiary @likwid.

I think that the voters will receive the curation rewards as liquid STEEM or so...

the weight for both votes was 100% as shown as well on SteemWorld.

I know this sounds confusing, but there is a field percentage and a weight for each vote. When a developer talks about the weight, in most cases he means the calculated weight/effect of the vote... ^^