I recall reading on the Vocaloid Wiki that one reason some Vocaloids sold the way they did is because producers had their characters/voices they selected and committed to, whether that was the earlier releases of an engine or producers who specifically only ever bought the latest version of Miku. But with SynthV, and AI vocals in general, I'm noticing the opposite. As SynthV continues to drastically change with every update and get more realistic, new releases are more realistic than the last. Thus, users are always chasing the latest and popular voices while throwing the ones they already have under the bus (and let me tell ya, this gets expensive). I have observed this in several ways:
-Look at forum and Reddit discussions. Notice the transition from talking about Mai to Ayame. Asking about buying Stardust to asking about buying Minus.
-And likewise, on Discord when trading vocals, people are usually looking for the latest vocals, sometimes even trading vocals that only came out slightly before them, like trading Anri Arcane for Minus (although, this isn't the best example since most of those people probably got Anri Arcane for free).
-YouTube cover artists; as pointed out in an earlier discussion on this forum, in 2022, everyone and their sister was using Solaria for everything. In 2023, Solaria usage dramatically fell after Teto came out.
-My own experience with this phenomenon. I used to comment all the time "ooh, this new vocal sounds so cool, I want to buy this vocal eventually." I said it about so many vocals. I used to collect all the SynthV Engloid character vocals until I finally broke the cycle by not buying Saros. While I still like Solaria and Asterian, the peak of when I cared about them was when Asterian came out, and I sometimes regret buying them because I never use them (The reason I don't is because I would have never gotten their physicals otherwise).
Activations are tied to a serial number that is built into either the HD or NIC card on your computer (You choose which one when you activate. It's the HD by default.) If you activate and then the chosen piece of hardware fails before you deactivate (meaning that the Vocaloid software can't access it to retrieve the hardware's serial number), that activation of the Vocaloid software is wasted.
You can waste 2 activations of a Vocaloid VB in this way. If you waste the third, you can't activate again.
If you do have 3 wastes, you can reach out to the software maker (e.g., Crypton), and once you explain what happened and probably provide your Vocaloid software serial code, they can probably reset your activation count for you. But it's obviously easier to do your best to avoid that.
Anyway, hopefully that clarifies what the situation is that would preferably be avoided.