Is this not inappropriate behavior in the eyes of Jah? Surely it must.
http://savedfromthewatchtower.blogspot.com/2011_09_01_archive.html
"TO ALL CONGREGATIONS IN THE UNITED STATES
Re: Donations at circuit events by debit or credit card
Dear Brothers:
At Deuteronomy 16:15, Jehovah commanded those celebrating the festival of booths: "You must become nothing but joyful." Similarly, circuit assemblies and special assembly days are always joyous occasions because of Jehovah's abundant blessing. In view of this, many show appreciation by making voluntary contributions at the assembly.
As in previous years, voluntary contributions can be placed in the contribution boxes either in cash or by check made payable to the circuit. However, a new arrangement for making donations by debit or credit card has been approved for congregations that hold their circuit events in Assembly Halls. Locations for making debit or credit card donations will be announced at the assembly.
We pray Jehovah's rich blessing on your preparations to attend the circuit assembly and special assembly day programs for the 2012 service year.
Your brothers,
Christian Congregation of Jehovah's Witnesses"