I don't know if this would have an important effect on the business model (or if it's part of the reasoning of 'not wanting to be a hedge fund'), but being in that position is going to give you a very hostile user base.
As a music fan, I can't stand scalpers. I understand the principles of supply and demand, but scalpers subvert this because you don't necessarily have to resell all the tickets you purchase to be profitable - just enough that your margin covers the unsold ones. The only people losing are the fans, who can't get affordable tickets, even when the venue is half full.
I had no idea how bad the scalping situation was until I tried to buy tickets to a show in Chicago (in Australia where I live, it's a problem, but I've never been in a situation where I couldn't get tickets by buying them when released). I stayed up late (in my time zone) to get tickets, and missed out because the website wasn't dealing well with the load. Next morning, I got up, and there were 400+ tickets for sale on StubHub. For a 1300-person venue. Even if 100% of scalped tickets went on sale, on one website, within 10 hours of the event going on sale, that's still 30% scalping rate.
There are a number of solutions both easy (printing name and date of birth on the ticket, which is matched to ID at the gate) or difficult (personally I like the idea of taking 'bids' for tickets - the maximum someone is willing to pay, and then at a cutoff date taking the nth person in line's bid (of an n capacity venue) and issuing all tickets at that price. Minimal risk for promoters as they can cancel if they can't manage a reasonable margin, and no one overpays for tickets).
Anyway, I digress. My point is, I think potential sellers would see this service as ripping them off, and would be hesitant to list tickets unless they weren't confident they could resell them, and buyers would resent them because you're essentially taking a large margin for almost no service. If the algorithm works there's minimal risk for the company, you'd just be taking free cash. I could see myself as a buyer actively avoiding using this (hypothetical) service where possible because of it, and sellers also avoiding it as they perceive an offer from you as a way sign that value would go up and they shouldn't sell now.
As an aside, when I was in the US I got a ticket to see the SF giants for about $10 for great seats on SeatGeek. Was super happy with the experience (and the people next to me who so generously offered rules clarifications for me).