1. If the reader liked the samples of the short stories then it would be more cost effective to buy them as a collection.
2. Another book with my name on adds to the growing list of books which in turn helps to promote my work.
The royalties for 'A Collection of Shorts' will be around the same as selling all of the stories separately so I'm not losing anything in that regard by releasing the collection. It will be interesting to see if readers are tempted by the price of the collection rather than buying just the one story. So far 3 short stories have sold. I'll let you know if the collection start selling more.