Well i beg to differ ..
OEM product is a product to be sold to other companies for using it in their systems
eg.. If I am an assembler and I sell my computers with my brandname. Then I'll purchase OEM Sony DVD-writer coz it doesn't say 'SONY' on the front panel.
The cost of OEM model is lower coz the buyer is assumed to be a retailer, who needs to make some profit. Also the assembler don't need all that IDE cables, screws coz they buy them in bulk. All they care about is the lower cost for genuine product.
On the other hand the end user seeks for the accessories provided. So the pacagking is attractive, contains manuals, guarranty card, cables etc.
eg If an end user has to buy screws, IDE cable and the DVD writer from different shops, then he will automatically look for a company that gives it all bundled, so what if he has to pay a little extra.
I think u got my point.
Dealers tell that Box packed r better coz they have a larger profit margin with that. Also a new customer will trust him if he tries to sell an attractively packed product.
I always look for OEM models.