I would not do this, especially for new players. Cost too much gold, when you can farm for boxes. Just farm for boxes and save them up like crazy. When ready to upgrade, open the boxes. You save gold for upgrading by doing this. If you craft common, you are wasting gold.
I use to farm like crazy on OD6 and get around 30 to 50 boxes a day. Math that out for 7 days, and you get around 200 to 400 boxes. Times that 200 by 3, and you get 600 items that are either common or rare, and sometimes epic. Crafting 600 common cost 567,000 gold. I rather save that then spend on crafting. If you are going to be a full on f2p player, it is best to save as much gold as possible for upgrading. Gold is more essential than tokens, especially for f2p players. You don't throw away gold for common, when you can farm common.