If you’re worried about resellers, price your stuff better. I’m not meeting any bros at the local cons, and locals ain’t looking to make bros unless they want a deal.
This is great for someone who has experience and is a regular at going to the various events.
For someone who has never done it, paid the fee to be there and wants to get the most they can out of their stuff, then it isn't a matter of just pricing it better. Mostly because there isn't a frame of reference. Convention pricing tends to jump around from what I've experienced, depending on where you are and when you are there and what is popular at the time. Christmas shopping season, tends to see a lot bigger markup from dealers as well, also the bigger the convention the higher the prices usually, as there is a bigger market of potential customers and a greater chance of someone buying that overpriced item. There are other things in there as well but I'm sure one gets the idea.
That being if a person just wants to move their goods and be done, then find sell and be happy. But then why even bother with a convention, when there are plenty of free ways to do it. You're paying to be there, and If you're trying to get the best you reasonably can (I'm not talking about ripping someone off), there is no reason to let yourself be taken advantage of by professionals who are just going to profit at your expense.
A person going in new can do research but that doesn't mean they will be on point in that instance at that convention. The dealers who are regulars, will tend to though.
Its not a matter of being worried about resellers, so much as it is a matter of understanding these guys are there only to make money. If they are willing to pay your price, then your price is too low. They won't pay what they can sell it for, so why let them sell it to someone for more when you can do. It's just handing them free money.
When, you set up your booth in many conventions, it gives you access to the dealers area before the customers. This tends to be when the dealers and their crew are making the rounds to look at the booths of others to see if there is anything they can scoop for a quick profit. I've watched it happen for years.