Is it odd if you sell your own branded products and website but also start supporting products of other brands?

I'm in the computer electronics niche selling my branded products, but i wanted to bring in more traffic by also selling items different to what im selling, that are already popular.

For example I sell my own branded headphones, my social media and marketing since startup has been focused on my brand, would it be weird to start stocking, popular branded items that "support" my branded products, eg in the case of my "headphones", i sell headphone cases, cables, stands etc that are other brands?

Pro's: More traffic to my site and my "headphones".

• Possible chances for higher order values / slight increase in sales

Cons: Brand might not seem as established. It seems i'm going from a brand to a retailer?