the site used to allow the option to look at systems and controllers to see their values and now that option is missing.

Add to NES price list. There won't be a loose price as the only way to distinguish this version from the regular version is the sticker on the box itself, but CIB and New copies command much higher values than the standard retail version.

It would be helpful to be able to print and pay for shipping labels of this site

you dont have expansion modules

It is a hassle, especially if you have many items, to know whether your listed prices are in line with others who might also be selling the same game(s). An example is Amazon's "Match lowest Price" option for sellers. It keeps prices in check while also helping to curb artificially inflating game values.

We need to be able to communicate directly through the website. The e-mail messaging system gets lost with the hundreds of other e-mails I recieve. Plus it'd be a lot easier to organize and go through the messages and whatnot

It would be useful to be able to view the marketplace through the mobile app. I would especially be interested in features similar to the eBay mobile app. Mainly ones, such as getting a notification on my phone when an item sells. This would allow me to potentially ship sold items more quickly.

Let me see only listings with actual photos of the item instead of stock photos.