I'm not sure what you mean by "dealers' and "individuals".
Many quite large sellers are in reality "mom and pop' operations. (Actually pierrelebel one of the oldtime gurus here was just a 'pop' operation, with no staff at all).
Then there are sellers like myself who have eBay Stores, because we have slowmoving merchandise. We can be one woman operations too.
And there are dropshippers, who single sellers often very small time, who are fronting for giant Asian enterprises who actually package ship, describe and photograph for them.
If you are having problems wading through thousands of items to find the right stuff at the right price, try changing your Search to Highest Price First or Highest Price + Shipping First. it is easier to drill down through dozens of listings than to drill up through thousands.