If you miss worship on the first day of week does that mean your pocket has a little extra in it to spend the rest of the week?
If you answer yes, you have the wrong answer. Giving as we have been prospered means exactly that – giving as we have been prospered; not giving as long as we show up to worship! If we miss worship one week, but we prospered that week, then a portion of our prosperity from that week still belongs to God. And to deny that is to deny God (1 Corinthians 16:2, 2 Corinthians 9:6-11).