Technically, I purchase the machine from them, then offer it off for sale here. Makes everything easier.
For our GBs, we immediately send funds to the vendor or partner, such as bobsag3, once all funds are collected. Payments are made in BTC.
Another important fact: if the value of BTC rises while we're holding the funds and we can buy more hashrate (such as extra modules) with the collected BTC, we automatically credit that extra hashrate to that Round, like we did for R8B.
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BTW, bcabes, OT: we're looking at alternate BTC ATMs, esp. the new one that launched in Turkey that only takes deposits and is supposed to have much less legal paperwork involved: http://www.reddit.com/r/Bitcoin/comments/1qw530/worlds_second_bitcoin_atm_opens_in_istanbul/cdi8y7l
At this time, unfortunately, however: we can only offer our BTC ATM services to qualified investors or groups buying an entire BTC ATM or more.