Doubles

I want to get some thoughts on what people keep as doubles to sell and which coins go in a bulk lot to sell. I like to keep coins with a value of .50 Cents or more but also OYT or unc moderns. Now selling bulk lots for 10 dollars @ pound, around 90 coins, ends up about 10-12 cents a coin. Another thought is it worth selling or trading those coins I deem worth higher as bulk lots at a higher price or just individually?  
Thanks