You could create a comp where your first video is played 10 times and then use CompsFromSpreadsheet to create copies of that comp for the 99 other videos.
Templater also has very powerful workflows for these kinds of batch processes.
The beta testing phase of my upcoming tool Automation Blocks will start soon and might also be an option for these kinds of automations. Let me know if you want to join the beta. Automation Blocks allows to create your own automations by combining "lego bricks". See these tweets to get an idea: https://twitter.com/search?q=%23AutomationBlocksAe&src=typed_query
If all videos are similar duration and you don't want to do any scripting, its possible with a bit of manual labour.
However, few questions are important:
1. How existing media files are named? Do they contain particular naming convention?
2. How you want to export them?
3. Does exported video name matters, and if so - provide a naming convention based on the 1st point.
Accordingly, you could prepare a template boilerplate, and by duplicating the folder and manually replacing video in a folder do the renders with AME. Its not ideal, but could not require scripting, nor other tools at all.
The ones mentioned by Mathias are spot on though, in addition to scripting action by yourself.