“, yes Pesach stuff is different than regular stuff, but I usually try to get stuff I am familiar with and brands that I know so its not as hard as you think”
You are the only one who says it is difficult to check the hashgochas, no one else said that. All the other people concurred that you always have to check the hashgochas and specifically for pesach when there have been many occurrences where items that were not pesachdik, got mixed in with the pesachdik in stores, for any number of reasons.
Checking the items one buys is not a “chumra”, it is basic halacha.
And your answer to does not answer how you can possibly look so closely at prices, which change all the time o determine what cost more?