DPI and Exporting File Sizes

Adobe Illustrator exports files out at 72 DPI.  Inkscape exports files out at 90 DPI.  Since most craft users only have access to Inkcape (a free, open-source program), most cutting based software is set to 90 DPI as a standard.  Translation: Our files at 72 DPI import in at 80% the size they are supposed to.  Solution: Change the import settings.  MTC and SCAL both accommodate users in this aspect.  Our cards are actually set at 5.5 x 2.12 give or take...so they hold true to the size they are supposed to.