I can vouch for Valkir !
He has 100% my trust.
Well I just went back and looked at every month since August and Valkir has posted in every month since then.
So your claim of posting gaps makes no sense to me.
I have done business with Valkir on a few occasions.
So I personally would trust him with some escrow or do a send first to him in amounts under 2 btc.
Frankly I do not love the escrow system developed here on bitcointalk as I have a more perfect sales/buy trade record then almost anyone on the site .
One thing that is a good point is a staked address is not a bad idea. If needed I could hold 2btc as an insurance policy.
Right now I have Valkir marked for trust and I would personally trust him up to 2-4 btc.
But we have to be careful we have had issues. We had an escrow guy run with about 10 coins.
I just ran 2 group buys for avalon6's with more then 90 coins put into my hands
https://blockchain.info/address/1BHKKrAh5oTacQnmjfACXjE9cGyFRR8rVD
https://bitcointalksearch.org/topic/re-new-group-buy-avalon6-1100-closing-soon-thur-the-28th-now-closed-1342921
https://bitcointalksearch.org/topic/group-buy-avalon6-1100-closing-jan-12-at-600-pm-est-1318003
Valkir ran a group buy for compac sticks I am pretty sure he had more then a few coins on hand for that.
here it is.
https://bitcointalksearch.org/topic/sidehack-stickclosed-group-buy-for-canada-1121237