Uglobalshop.com - need your feedback please

as an FYI - it seems that your blog is not linked correctly. It currently goes to http://blog.uglobalshop.com/ which is a dead link!

is MKEnterprise still in business?

Their website is down.

Power sellers charge High Shipping Rates

As noted, the reason you're seeing this practice is mainly to avoid ebay's fees (which aren't calculated on shipping costs). It's not unreasonable to charge a higher than 'just the actual shipping...