So far I've had over 1,000 requests for G+ invites, although there is some duplication included in those figures as some people have entered their email address more than once. I reckon I've sent out over 900 invites to real people.
Out of those people:
14 have left a rating on the market
11 paid £1 each (of which I received 70p)
9 have individually emailed me to ask for an invite
6 have left comments on the market
Since yesterday morning, the invites are coming in fairly steadily at about 15 per hour. The peak time was between 10pm last night and 2am this morning, when we hit about 17.5 per hour.
1 hour ago