Potbs could have made its way as a niche subscription PvP/RvR game. But fls never gave up on it being the next WoW, so they kept adding 'content' and trying to appeal to a player base that the game just didn't have. Everyone I knew that stayed on Potbs was there for:
1. The good community/ light hearted flaming ( area chat PvP anyone?)
2. The PvP- 6v6 was really well sorted
3. RvR- I reckon this was a problem, as to my mind RvR worked best with a smallish nations of (100s) active players. It was much more fun as Spain than Brits for instance. Being a Brit and winning meant grinding 100000 points to get into a pb and an influx of unskilled players everytime u won 2 pbs.
4. Serious Eco players.
A good community makes it own content, look at epic Roberts map autumn 2009 (I think), infinitely better than a few siege tooga runs, even though us Brits lost to the Dons, but that was Ubert's fault for not calling the dons as a contender for victory soon enough!
Hopefully naval action will pan out like that.
What finally put the last nail in potbs coffin for me was being perma forum banned for being Tem, which is annoying when ur not Tem. I think portalus decided that there was only one person in the world critical of them, so any post pointing out the flaws in their game was that man...