Here the pennies dropping...

As a small child I sang 'Hear the pennies dropping, listen as they fall, everyone for Jesus he shall have them all.' And apparently there are still those who need to hear the pennies dropping. In an age where cash is not used so much and many rely on electronic means for many matters, there is less visibility (in some cases) when giving to the church.
So some churches have devised methods to make people feel good when the plate/offering bag is passed around.They give people a little card to pop in the offering to show that they have given electronically. A bit like the badge on your chest that shows you've donated at Badge Day. (Do Badge Days still happen??)
In the church where I grew up there were dated envelopes for people to put their giving in. They were even separated down the middle so you could put some for missions and some for the local church. I guess you had to have the right money for both portions on hand each week.
When we first earned our own serious cash we had become part of a church that had a stewardship system. One of the officers of the church came to visit us (two rich school teachers) to see how much we would pledge to give and to make sure we had a set of envelopes. Being young and idealistic we informed him that we didn't want to be bound to a set amount. What if the Holy Spirit encouraged us to give more than we'd promised. We didn't want to be locked in. Imagine our surprise (were we naive or what?) when after a few months we received a letter commending us for our giving of  x dollars. (Yes it was dollars. We are not that old!) It was then we realised that the envelopes were all numbered (which they weren't in our growing up church) and our giving was recorded. Nup, that was the end of that. We believed what we gave was between us and God. and sometimes the taxation department who queried the  amount we gave in support of charities until they go the idea that that was normal for us.
And so now I wonder about the need to be seen to be giving by putting something in the offering. Didn't Jesus say something about that? And if it's a matter of people needing to know  eg children needing to know about these things can't we simply tell them? There are so  many ways of giving that don't include money on Sunday morning.
Anyway if this is the was things are going, I  want a little card that says 'I put mine in last week.' for people who get paid fortnightly or maybe one that says 'I'm skint this week.' or 'I spent my offering money on something else.'
Or maybe just an empty envelope or........