Look, i'm gonna give you the realities of selling on ebay and flea markets cause that is what I do:
eBay: The competition is fierce for newer stuff. I have seen it time and time again sellers underselling each other to make a sale. I know that the stuff sells for and after ebay fees, paypal fees, packaging and shipping they ain't making jack.
The rare collectible you once got for a coupla dlrs is few and far between. What was once rare at one time is now common due to ebay. People who you were once able to buy stuff from are now placing dead grandmas stuff on ebay thus cutting you out.
Flea markets:
You can make money here, but it is tough. Why? because you can find the same damn thing on ebay for cheaper than what you can get it for at a flea market and delivered!
Experienced dealers will tear you a new one. They love to corner the new guy and buy his stuff cheap. After you realize you cannot sell anything you'll dump it cheap. That is where I come in.
Competition and backstabbing is common. It's just like Bartertown in Mad Max BTD.
In a flea market enviroment you have to find what sells and people often make a mistake by buying one big shipment of the same shit. Only the wholesaler is the one making the money. You'll buy your stuff and a week later find out 5 vendors have the same thing.
Look, I do swap meets all over Kalifornia. i've been to em all. I know what sells and what doesn't.
I specialize and have a variety of items. I have connections(much needed) and you have to be fair.
I left a job paying 80k a year so I could stay home with my kids. Now, I make taco bell wages, but in the end it is all worth it.
Find your niche product if you do decide on flea markets or ebay. I can guarantdanmtee you it is a lot of work to find stuff. I cut that down by giving people my businesscard and now they call me. make sure you have operating capital.Nothing worse than coming across a great deal and you have 3 dollars and some lint in your pocket. Have a card like an AMEX to back you up for wholesale products.
One day I hope to at least break even.