After the interview, of course, they follow up with the exact same sort of line:
"As you know, we can't invite everyone. However, I'm happy to say that it seems XXX is doing great things in an exciting space and you've been selected for XXX, the later stage startup track at XXX."
Followed by this...
"Your code will reduce the cost from €12,950 to €1,950. As discussed the package includes 3 attendee tickets, plus a complimentary exhibition stand for one of the three days."
Afterwards, if you interact with them in any way, expect to get 5-15 average spam mails a week with "Guess who's going to be at our conference!" If you unsubscribe from the list, it seems like they just invent another conference to spam you with.
Not surprisingly, their "exhibitor" costs rival some of the largest and most successful industry conference costs, even though, in the case of the one I inquired about, it it was the first event that they had put on in that track. Afterwards, of course, "oh, but you qualify for our start-up track which lets you stand in this hall for one day for $5,000!"
Agree with earlier poster to avoid.