ermmm well I very rarely release public beta versions… coz the map is 99.9999% finished each time and there is a chance of it playing well on servers, therefore not a beta… I think many maps have had more than 5 public releases…
I think the problem here is in the labelling.
If you have 5 ‘finals’ out, then what happens to someone who stumbles across the first one and thinks it’s final but it’s actually bug-ridden?
NOTHING should be final until it’s been out, tested and you know it’s bug-free (as is humanly possible). Misnaming files in the hope they will not have bugs in them helps no-one.
So, consider a rethink - rather than pushing everything as ‘final’ 1, 2 etc and hoping for the best (and ultimately ending up confusing the hell out of people and making yourself look a bit silly) call them betas. Once you’ve got a rock-solid beta, either leave it at that, or simply re-release it as ‘final’. Trust me, you’ll have a lot less problems doing it that way, and looking more professional into the bargain.
Never EVER make gameplay changes and release straight to final - this is a kiss of death for any map.
And indeed, many maps have had more than 5 public releases, there’s no golden rule on how many are fine, although obviously a general rule of thumb is ‘the less the better’, but I’d extend that a bit to ‘as few as possible to ensure the final is bug free’. There should only ever be 1 final, there’s no excuses for anything else. Those that have had lots of releases generally fall into 2 camps:
- those with lots of betas and a final
- those with lots of finals
Now which makes more sense to be in? Even if it’s ‘only’ a naming convention it still helps.
Seems to me there’s two trains of thought in mapping - those who want a final as early as possible (usually prematurely so) and those who’ve gone the other way - witness the birth of the _FP versions of maps - maps so unbelievably unfinished but released! This is, IMO, the way to go, and in fact we started doing these as a direct result of people from SD saying that’s how their internal system worked. Now I may think I know a bit about mapping, but I’m still willing to pay attention to a company with a proven track record 
Where there are bugs in ‘finals’ (and indeed there’s some in my own map - eg church) you simply have to make a judgement call of whether it’s sufficient to warrant a new release. Virtually anything is better than multiple finals.
In this case it’s almost a moot point though - since all the maps are being released under a new naming scheme, they are in effect a ‘new batch’. Just don’t end up releasing multiple finals of these too, thassall.