To buy and upgrade, you have to click on the locked items. Unlike the unlocked items it won't show you the amount. Then you click again i.e. confirm purchase like you do in case of buying normal items. Yureka, you own it. Just remember, click or press corresponding key from keyboard twice. Purchase like normal items though it shows locked or plenty of '?????????' signs. As I mentioned earlier, it would cost you a lot of money but you can surely buy them. In my case, I had to use save editor again to increase my bucks.
There was no photoshop, no hax boss... everything I had told and shown were 100% authentic. You can buy and upgrade everything from the very beginning. All items are coded and available from the very beginning. Through corresponding update, the devs just unlock and set a particular price for each item. But actually you can force buy the items as I mentioned before. It won't mess up with your game. Same thing is true for TON also. You can upgrade your home fully right in the begining of the game.
Now my question is - after this long time with NLT games, nobody noticed that??? like, literally am I the only person who has ever tried it???