With the wildly varying quality of mesh clothing, most customers and many creators have realized the usefulness of providing a demo of clothing to test fit, skin weights, in-world appearance, complexity, and many other qualities of a given item. It has, therefore, become frustrating to see something I'm interested in, click on it, only to find I'd be gambling if I bought it because there's no demo available. I never buy clothing without a demo, and manually checking to see if a demo is available can slow down the shopping experience.
Add to that the bad actors that state "Demo available at in-world store." To date I have never found an in-world demo, and am instead barraged with a maze of other items they're trying to sell to me (a good portion of which won't even fit my body and also have no demo available) while I look for said demo. In many cases, I come to doubt that the demo even exists. This is VERY poor business practice, as I already have a mental list of stores to avoid while shopping because I know there will be no demo on the MP. Vendors: NEVER make your customer jump through hoops to buy your product. This is a poor idea and just a stupid thing to do. If I am shopping on the Marketplace, I'm not interested in switching to shopping in-world. Actual clothing stores have fitting rooms that are easily seen and accessible, not hid somewhere in the back behind the restrooms. You've just lost your sale.
If a filter can be added under the "Do Not Show:" category that specifies "Items with no Demo" it would speed up my shopping experience as well as allow me to more readily award those that perform best practices and provide demos for their products. I believe this will also have the added benefit of inspiring those that presently do not provide a demo, or claim to have one in-world, to actually provide a demo on the Marketplace to allow for shoppers to quickly and easily try on clothes.