For myself the inflation of box numbers was not due to requirements/macros/need. It was a function of wanting something else do to when I tired of the same thing over and over again.
If I had stuck with my original groups, I would probably already be done with T11 and then what...back to waiting for a group on live?
5 toons up to T5 because my computer only supported that many boxes at that time.
7 more added after I got a new computer till T10
12 added while progressing through T10 because I got bored farming gss before Veeshan was released.
12 added when I got bored with just killing Tunare every 3 days (but didn't get them leveled to T11 until I wanted a break from giants and Halloween was on)
For current total of 36
If I finish T11 before T12 I may add more or replace some, depending on how bored I get waiting and if my CPU will handle it
I don't remember who, but someone has soloed to T10 (they had support/wings) but, it's possible without the numbers. Past T10 probably not though.
When new users ask for box numbers, we need to rememeber our own progression/evolution as a caveat to the totals the end users provide. The recommendations that some of the new users have to start with large boxing groups is wrong imo and I feel adds unnecessary barriers to the server. I feel that by the nature of the progression and length that its natural to bring more along, eventually, if you stick with the server for as long as a lot of us.
Limiting the number of toons that can be use in T12 that we have spent a lot of time to gear/progress would be annoying. Having to gear more toons is itself a large penalty for having that many, but we have had years to do it at this point.