One of the things necessary for manifestation is an open and flowing emotional body. Everyone's is open and flowing as a default. You awareness of your emotional body may vary at times going from total cluelessness to very acute.
When we want something that is easy, like a cup of coffee, we don't put much fanfare into it. We go get it and we don't get in our way. The emotional flow stays open and we get our coffee. Easy.
A new mini-mansion or sporty car might stir up your own internal programming and start closing the emotional space down. You may feel more with the big things, because the self is saying "hey, notice this space moving?" and that will trigger other programming about the space being too open and then we close the emotional space to deal with it. Hence the big things may take us more time to manifest because we have to work out our programming on them, whereas a cup of coffee doesn't stimulate any reaction at all.