http://blog.seedcamp.com/2009/09/awaiting-moderation.html
Is it possible that Reshma said what she did as a quick shorthand for letting people in? If she knew all the mentors from 2009 (which I understand wasn't you this year), the only other people allowed in were investors.
In other words, she didn't recognize you as a mentor, so asked if you were an investor (the only other group allowed in). And for people she didn't recognize, she provided a sensible shorthand answer for why they couldn't attend. If you're trying to keep the trains run on time, you don't necessarily have the opportunity for a more complete Q&A.
I don't really have a stake in this argument, but just really like what Saul and Reshma have done with Seedcamp.
From a startup point of view it is reasonably serious but for a single investor 50K is small, very small.
If a fund had an entry ticket that low I would definitely look elsewhere, I would be very worried about small time investors coming on board with very little experience and a risk profile that does not belong in the venture capital world, especially not the seed world.
If it was operated by large investments by a small number of VC's, the model could provide problematic signals. Specifically, if those VC's get early and in-depth looks at these companies and choose NOT to invest, it would be a negative signal to other investors. By spreading this across a large number of VC's, this potential is diluted.
The investors in Seedcamp are well known and respected investors... they're not "small time" with "very little experience". And many of them are long-time seed investors.
There are multiple other pitches (at the start of Seedcamp week, at investor day in December, etc) that are meant for a more public audience.