You will need to formulate a buying strategy. This could be in the form of collecting coins according to your own personal interests, or simply amassing examples that are consistently popular, rare, etc. If you put together a topical collection that represents some importance, that alone may drive your prices up when you go to auction. Let's face it. When concerning resale value, it is always best to go with the best condition possible.
Style is also a consideration here.
Your collection of Judaea Capta coins will be worth much more in VF or EF than in VG or Fine. A great many dealers have given bad press to hoards, but they are great opportunities. Hoards can often present interesting varities and types, not to mention high quality. Having watched hoards come and go over the years I have noticed that prices drop accordingly initially, then go back up once they are absorbed into the market. When you sell is of great importance.