I have a statement every month that tells me what and where I've spent my money. I can also use those purchases to show where I was at at the time if need be.
Mmm-hmm. Well, if you can't keep track of your spending, I suppose that'd be a reason to want to have others do it for you. I don't have that problem, personally, so it's difficult for me to emphasize with your use case. As for needing to show where you were... who do you need to show this to? The very fact that you think you need to show it to someone is worrisome, and speaks more to the problem than any solution.
Why would you worry about your purchases being tracked?
Because the government thinks it's perfectly okay to directly violate the constitution that authorizes its existence, that's why. Because the government is trying to look at the people's persons, houses, papers and effects without warrants, that's why. Because the government will, if given a chance, interfere with personal and consensual choices it has absolutely no ethical reason to concern itself with, that's why. Because the government runs a system of unjust gulags, driven by a manifestly corrupt legal system, which one should avoid with great care, that's why.