Start a reseller model vs. 'Dell only' for accessories
I was looking from RAM and an internal HD to upgrade my Dimension 4600 machine. However, when i looked on the Dell site, I could find only 'reconditioned' hard drives. To add insult to injury, I found I could get new drives at a better cost/capacity ratio from other online vendors. Why in the world would I then buy from Dell? In the end, the only thing I bought from Dell was the mounting bracket to make sure I had the right one.
I suggest you do like Amazon, and start partnering with other vendors so I have one-stop shopping. I will not pay more for the DELL name, but if you are the most convenient vendor for me to do all my shopping, as Amazon, is, then I will shop with Dell. The customer can get better selection and pricing, and you can find some way to make a reasonable commission profit.
Please see amie_p's comment