Terence, great post!
Let me point out some things though:
– The average beacon cost is around 30 dollars, but there are some inexpensive chinese eddystone beacons that sell under 10 dollars!
– you use the term “ibeacon business cards” but in fact you use the exclusive functionality of Google Eddystone beacons for this! In fact, you could only achieve the same functionality with developing/using an app with iBeacons
– Just to note: Software simulation of beacons is taking off in the past weeks, you can download an eddystone beacon simulator for your mac, or alternatively, Bluetooth 4.1 capable phones support eddystone beacon simulation!