SportsGamingTV.com, sounds like you're talking about a setup where all videos at your site get either the same ad (if you only have one to show) playing pre/post roll (as the case may be). Alternatively you want to have the system cycle through ads you've uploaded at random on all videos?

The reason I would want to have it set up so that each video can be edited (or bulk editing with checkboxes for multiple videos) is because some advertisers may have a problem with their ads appearing pre/post certain videos (I'm sure the adult sites probably won't have this problem, but a lot of niche sites might). There may be an issue of poor taste, unrelated market etc... and if people start watching a video about eg. "The Pope's Annual Address" preceded (Sponsored by) Trojan Condoms.... :lol: - You get the picture... People start writing letters, lawsuits get filed and "bye-bye baby", the end of a good thing.

Allowing for control over which ads are assigned to which videos is definitely the way to go. Having a bulk edit option would probably be the easiest way to satisfy everyone - that way you could go into the "Edit Video" page, select an ad/commercial (either from a drop-down menu, or by typing in the path to..) and then assign it to the video being edited (or alternatively to all videos in a certain Channel if there is a separate menu page for ad settings where you can select the ad and then check off the relevant videos you want it assigned to; or simply hit the "Select All" checkbox to assign it to all videos). Taking it a step further would of course be the option of having different playlists as you mentioned (instead of just a single ad) and being able to assign a playlist to a bunch of videos/Channels in the same way - then the ads can show on the selected videos/channels in rotation.

I can definitely see the benefit of having a playlist/rotation of ads available for assignment to videos, but having it set up by default to show the same ad on all videos is probably not the best way to go, besides it would effectively devalue the inventory. The way I see it, as a site starts getting serious traffic and people start rating videos, some videos will naturally get more eye-balls than others - that's where your money is :) You charge more to advertise alongside the busy videos and less for the not-so-busy ones. You'll be surprised at how much people will be willing to pay to be in front of a busy channel as apposed to having "site-wide" coverage on untargeted videos. Nowadays it's all about targeted traffic and tracking click-throughs/or views in this case.