Yes, you should be concerned, Home Depot was hacked, many large retailers have been hacked. Minimizing the number of places you provide your payment info to is prudent! Good devs can have no-name payment processors, see my post #126 which lists the CC processors of 2 popular apps, one has many hack references, the other I didn't easily find any but again, who are they? How well do they protect my data?
Sure, that protects that one CC, but every bit of your information that gets collected, hacked and sold makes it that much easier for someone else to steal your identity. Please do not try to act like this doesn't happen, why do you think when major retailers are hacked they all give away a year + of credit monitoring? CYA!
And when some folks don't have a good argument they resort to insults, however mild or veiled. I'm not scared, I'm a realist, hacks can and do happen... often. I also highly value the unique marketplace I bought into and some want to destroy that via legislation just so they can have their cake and eat it too.