Resellers obviously get discounts depending on how many servers the reseller has. I don't think 80% of Resellers have a max of a 20% Discount and 20% of them have a 25% Discount.

Not all resellers are reliable and depend on the provider way too much. If the reseller was however from someone like Softlayer or ThePlanet they each have strict regulations to become a certified reseller, however some of the entry-level-low-pricing resellers tend to rely on their provider way too much.

However what kind of server are you looking for and what is your budget maybe one of the members can advise you to a provider.