Doug said:
Is it in the design of this equipment that we will see ourselves presented as a target?
If so, why only twice over the 2 years did I see myself?
The answer is that your position _is_ (or at least, "can be") included in the list of traffic targets delivered to you via ADSB.
Knowing that it's not desired to see your own self as a target, the iFly software uses logic to try to determine when a target is actually you, and filter it out. It generally does a pretty good job of that, which is why you don't often see yourself.
However, there's no way to perfectly determine if a target is you if you don't also have an ADSB-out transmitter. (In that case, your N-number will be included as part of the target data, so that makes it easy to filter out.)
So, occasionally, the logic fails to identify your own target and it gets shown to you.