Your talking about that one website, and nothing really wrong with paypal, or money order, or sending in a check.  If you dont want something connected to you then your either paranoid or its illegal, really no worries connecting yourself to 99 percent of businesses out there to buy anything online.  Yeah graph would be cool and I have seen something similar, but its really not the difficulty, its just at 2 bux a bitcoin, you have no choice but to spend about 600  to 700 bux for a decent mining rig, its going to take a long damn time at 2 bux a bitcoin just to break even on just your rig, then you have the difficulty and electricity that gets into play more after you finally break even in years lol.