No, you don't receive a return in HP.

On a larger scale, this is something we've been discussing how to improve. We definitely realize the way Life on Kill works right now isn't very co-op friendly. When you're playing with a group of people and sharing your killing blows, the affix just doesn't have as much value as it does in solo games, and that can be a really poor user experience. We also recognize the same applies to various skills, such as the wizard's Archon ability.

We still want players to feel like they can gear/build their characters differently for solo vs. co-op, of course, and we think there will always be some affixes and skills that are better in one more or the other. But, at the moment, the degree of advantage seems like too much of a swing (I imagine a lot of players would agree). We've been discussing possible solutions for how we can bring LoK/Archon/etc into better balance between the two game types, but haven't settled on the best course of action just yet. This issue is absolutely on our radar, though, and we're certainly open to your feedback in the meantime.

Thank you for posting about this! We’ve also noticed this issue while we were playing and looked into it. We found there was a bug (mostly with Monster Power) where monster hit points were not always scaling correctly when they spawned and resulted in creatures running around with less than maximum health without anyone or anything having damaged them. We plan to fix this issue in a future patch, but since it’s not a critical bug we don’t have an ETA to share just yet.

Selling Gold
You are not allowed to sell, trade or somehow transfer Loot, characters or any other Diablo III content outside of Diablo III or the Auction House.

Diablo III auction house terms of use, point 14, c:
http://eu.blizzard.c...d3rmah_tou.html (Blue Tracker / Official Forums)

We’re delighted to announce our presence at DreamHack Winter 2012, taking place November 22-25 in Jonkoping, Sweden. We’ll be providing plenty of entertainment and hosting various fun activities that you can take part in, and we’ll also have several prizes and goodies you can win, like for an example World of Warcraft Action Figures, StarCraft II Mega Bloks Battlecruisers, Collector’s Edition boxes, and much more. Check out some of the things we will be doing at the event below.

StarCraft Academy
In addition to watching StarCraft II Tournament at the event, eSports fans will have the opportunity to attend StarCraft Academy and learn how to play StarCraft II from professional gamers.

Jade Serpent Challenge
World of Warcraft players at the event will be able to participate in a challenge mode dungeon contest, requiring the highest skill and teamwork. Those who accept the challenge will be able to use their own computers to compete, and we’ll select the fastest groups to battle it out on stage for glory and cool prizes.

Hang Out with Blizzard
All visitors at DreamHack Winter 2012 are welcome to meet up with us at the StarCraft II Tournament Area any time during the event. If you’d like to chat with members of the European Community Team, or simply have some fun with our friendly Pandaren Monk, come and say hi! We’ll gladly spend some time with anyone who wants to hang out with us.

Roundtable Discussions
We’ll host three discussion sessions, one each for World of Warcraft, StarCraft II, and Diablo III, taking place November 23 and 24 in a closed conference room at the event. We’re interested in hearing the thoughts and opinions of players on a number of different topics that will be discussed during the sessions. There are only a limited number of seats available, so the sooner you sign-up for these discussion sessions, the higher your chances are for a seat.

The discussions will take place at the following hours:

World of Warcraft:

• Friday at 12:30 CET – 14:00 CET
  
• Saturday at 16:30 CET – 18:00 CET

StarCraft II:

• Friday at 16:30 CET – 18:00 CET
  
• Saturday at 14:30 CET – 16:00 CET

Diablo III:

• Friday at 14:30 CET – 16:00 CET
  
• Saturday at 12:30 CET – 14:00 CET

If you’d like to sign up in advance for the Roundtable Discussions, please send us an email at Community-EN@blizzard.com with [DHW12] included in the subject line. Let us know your name and indicate which discussion session you’d like to attend. Please note that you must be at least 16 years old to attend the Diablo III discussion.
It will also be possible to sign up for these activities during DreamHack Winter, as long as spots are still available.
The fun takes place November 22-25 at the Elmia in Jonkoping, Sweden, and we hope to see you there!
To find out more about DreamHack Winter 2012, visit the official site.