1.Increase the total number of web pages.
2.It is good for GoogleBot including site pages.
3.Help customers quickly find products.
The fact that a site tag is very important,a lot of google indexed pages are tag page on a lot of site.
You can "site:www.dressale.com" on google.com. You will find this site is a collection of 1,730,000 pages by google.com.
Look closely you can find many pages included are tag pages. So please hurry to increase your tag pages.