Technically, you can do whatever you want, I suppose.
I don't think this is a good BUSINESS DECISION, however...
An eCommerce site should (if you are serious about BUSINESS) have the single-minded purpose of getting people to place orders.
BLOGS have a very different purpose on the WWW. People go to blogs because:-
- They have lots of free time - suggesting that they are not in gainful employment, so have no money to spend anyway.
- Want to gossip and participate in banal discussions.
Nobody visits a BLOG with the principal intention of BUYING anything. They MIGHT be led towards buying something, but the chances of this are relatively low...
So... we tend to advise our clients to keep their BLOGS separate from their eComm site(s), and to use them as "harvest sites" to point people to the eComm site(s).
In our opinion, the ONLY WAY you want someone to leave your webshop is through the checkout counter...