Hey i'm with you man, i think we all hope you're wrong lol.
It's just that there are so many people who think big sites like bogla/arcus etc are their ONLY way to buy gold. I've had so many people come to me buying or selling to me for the first time and they say like "i've always used bogla but my friend told me...." etc. Those people who don't know any better payed extra w/ bogla/arcus for the trust and they'd be willing to do the same with private sellers, assuming you're not some random with 0 reputation, of course. I think most people who sell gold frequently can agree here.
In regards to the spread, it could definitely happen. What i described above literally works both ways, people will be willing to buy higher for trust and they'll also sell lower.