For an ecom site it would be best to forward any satellite sites to the main site once they have achieved some decent rankings.
Redirect the whole site to your main site. It works perfectly fine. Also, the days of a redirect not passing all benefit are gone, they pass all benefit now. If you have a site not converting redirect it to your main site. It is exactly the thing to do. Don't be scared. I have done loads of redirects they work and they stick.