At the least, shouldn't these come in the standard magic colours, plus rainbow (for multi-colour and legends, and gray (for artifcacts/lands)?
Also many card sets for magic are over the sizes available, perhaps having something that can accomadate 40+ sheets.
Most collectors don't use both sides of sheets so their cards aren't crimped or damaged.
I realize that it's not all about magic, however something like 90% of the CCG market is magic, so having those options only increases the sales of the portfolio's.