When I use the term reseller pricing, I'm referring to what you can expect to get if put up for sale to domain resellers, for instance on the sales forums here at NamePros, eBay, etc. Also could be thought of as a 'Quick Sale' price.
End user or retail value refers to a fair price if the "ideal" buyer is located. It usually takes effort and salesmanship to sell domains at this premium pricing, though sometimes you'll luck out and be approached by a motivated buyer.
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Same thing, actually. The 'ideal' buyer RJ mentioned would be someone with a real use for the domain, i.e., development as a primary or complementary website, or for search engine optimization. 'In the end', they actually put the domain to good use.