Hey, I know with storage auctions you kinda get a little bit of everything, toys, clothes, electronics, etc. This is great and you can make great money as you generally get your merchandise at very low prices. Problem being it doesn't get you repeat customers. The guy who buys your Thomas The Train Toy Set is probably not going to be interested in your Coach Purse.
Basically everything in ebay revolves around volume, lower paypal fees, lower shipping fees, this allows you to offer more competitive prices and rise above the competition. Also, the more volume you do, the more people look at your listings the higher you rank in searches and both these things raise your ebay score which inspires buyer confidence and also helps in searches.
The only way to truly rise to the top on ebay is to have repeat buyers. Why are repeat buyers good, because once someone has dealt with you they trust you, you build a relationship, they wont harrass you when the post office runs a few days slow, they wont open cases against you, not only will they not leave you negative feedback but they will go out of their way to leave positive feedback to help you.
An example I give as one of the best product categories is silver. It's got a huge market and its something people want and consistantly will buy. Some people will spend hundreds or even thousands of dollars each paycheck or each month and will keep comming back to you. Obviously this is a tough market, changing prices, hard to find sources not saying you should get into silver but just an example of a category you will get repat buyers on.
If you do storage auctions yes your going to get random merch, however try to have a niche if its electronics buy auctions with electronics try to get merchandise elsewhere as well to add to your store whether its returned palates from best buy or something else.
Just some advice.