Link to scammer's Sythe profile: http://www.sythe.org/members/286295-hippyskankerr.html
Briefly explain the trade: This guy wanted to buy 430m off of me. We agreed on 30m increments both in PM, and in trade.
How they scammed: I gave the first 30m increment, and then he asked for another 30m. When I refused to give another increment before getting paid, he logged off RS and MSN without sending me payment.
Proof that you were not talking to an impostor: He was pretty sketchy, in that he didn't want to give me his MSN via PM, but he made the mistake of giving me his RSN within PM. He confirmed the same RSN within MSN and on RS itself.
Trade screenshots:

PM screen #1:
http://i85.photobucket.com/albums/k4..._pure/pms1.png

PM screen #2:
http://i85.photobucket.com/albums/k4..._pure/pms2.png


Chat screen #1:
http://i85.photobucket.com/albums/k4...pure/chat1.png

Chat screen #2:
http://i85.photobucket.com/albums/k4...pure/chat2.png

Ingame #1:
http://i85.photobucket.com/albums/k4...re/ingame1.png

Ingame#2:
http://i85.photobucket.com/albums/k4...re/ingame2.png

Ingame #3:
http://i85.photobucket.com/albums/k4...re/ingame3.png

The one clear cut proof of his guilt - is the RSN. He confirmed it in all 3 places - PM via Sythe, MSN chat logs, and Ingame. Finally, here's a screenshot of my paypal, just to illustrate the point that I still haven't gotten payment for the 30m transfer.

http://i85.photobucket.com/albums/k4...palscreen1.png

If any more proof is necessary, feel free to let me know.

__________________
.:[ Good Trades ]:.
-Sold an SMS PIN to Enit for 1.1m, Rip City MM'd. Trade went smoothly.

-Sold an SMS PIN to Autoforlifemoney for 900k and
1k chaos. Blizzind MM'd. Trade went somewhat smoothly.


.:[ BAD Trades ]:.
Hippy scammed me of 30m :\ Posted scam report.


.:[VOUCHES]:.

Banned, avoided giving me his MSN address as well so sorta goes along with what you have said.