Customizing a BigCommerce store is simple; not easy, but simple or straight forward I should say.
Why did you stuff the link with keywords?
Expect to pay anywhere from $600 to $1500 if you want SEO involved and depending how detailed your list of customization is.
Copying the style of a website is one thing, complete design and development costs a little more.
NOTE: there are no Loyalty programs on [BigCommerce at the time of writing this post. A shopping cart that allows for Loyalty Programs is [URL="http://www.shareasale.com/r.cfm?B=200808&U=497779&M=24775"]CoreCommerce](http://forefronton-linemarketingsolutions.bigcommerce.com/).