I bought a lifetime subscription back in 2004. That allowed transferring the radio 3 times. Have only done it once so far.
We do have two other vehicles with Sirius. I have all the same channels I have in the lifetime radio, and I pay $25 for 5 months per radio. The first time I got that plan, it was a promotion. But they have allowed me to renew it several times. The first time I had to ask a couple times for it and threaten to cancel. The last time I just had to ask once.
There are likely better deals out there, but I am good with this one.
And I think anyone that pays a "activation" or "renewal" fee is crazy. They are desperate for subscriptions.