There's no such thing as too many photos. You'll find your collection very useful if you ever seriously get into writing journalistically or commercially. You'll find people will want photos of everything. Then you'll be glad you kept all of them.

I regret deleting some of mine, because when publishers start asking for copyright on images, you lose the rights to use your own photos.

That's when you'll be glad you took a series of 10! Because you can choose one for the client and still use the other 9 as you please!