No suggestion has ever passed for this. It has sold twice for 8.

ACTUAL SALES

~8 (9 in mixed) - http://www.tf2outpost.com/trade/8715216 - hearts attendant+hearts drill+SF fj+sweets

8 pure - http://www.tf2outpost.com/trade/9887668

Other offers: 6.9 (beams stovepipe+hearts raincatcher+1); 6 (blizz ke+nuts frontrunner); 6 (burning tree); 6 pure

7.5 (8.3 in unusuals) – http://www.tf2outpost.com/trade/9785951 - GE anger + 11 keys

Other offers: 8 pure (twice)

~7.4 (8.2 in unusuals) - http://www.tf2outpost.com/trade/9449002 - traded hearts phantom+SF RL+planets brainiac for hearts pug+hearts cap+hearts blokes

6.7? - http://i.imgur.com/Bo4VV2k.png – he was offered the CM - beams merry+smoking flamenco+2 keys (I don’t calculate 10% reverse overpay, but I will take hats at middle value)

6.3 (6.8 in mixed) - http://www.tf2outpost.com/trade/10519261 - smoking crones+2

Other offers: 6.8 pure, 6.8 (ghosts beak), 6.5 (3 unusuals)

CURRENT TRADES

http://www.tf2outpost.com/trade/10502673

$300 – offered by someone with little stuff in his bp

7.6 (4.7+logo beak)

6.5 (ge tower+planets frontrunner)

http://www.tf2outpost.com/trade/10644969

6.9 – hearts reggae+1

6.9 – GE tower+1 pure+s original

6.4 – lantern bonk boy

High End: sold twice for 8

Low End: a bit tricky. 6.3 definitely seems anomalous since that guy had an offer of 6.8 pure. Setting 6.8 pure as the low end. A lot of the current offers top out around there, and there was one other documented sale that happened at ~6.8.