Well I've uploaded a load of files. Sorry if some are dupes but once I uploaded my own files (that I'd made myself) I needed more credit and started uploading ones I've found or foraged elsewhere.
It's a lie about 1 file uploaded gives 10 files credit though. I'm usually only getting 2 or 3 files per file. Maybe it's every 1MB uploaded gives 10MB credit.
It's a good idea but you should give more credit than that. There are so many more files to download than most people have to upload.