One thing you're all forgetting is that the different format requires more fields.
I dont beleive that. We have been running a modified version of M7 in the Norwegian Paintball League this entire season, the only difference is 12 minutes gametime instead of 15, and first to 3 instead of 5. And we run 16 teams with 3 prelim games, quarter finales, semis and finales (just as the CPL) in 1 day
The format proposed for D1 in the Millennium Series is first to 4, but 10 minutes game time. Wich means that you can run 32 teams in 1 field in 2 days. The Millenium has 3 days available and with the posibility to use the CPL field for half a day, it should be no problem at all to run CPL and D1 using only 2 fields. And 3 fields should be enough to cover the rest of the divisions for 3 days. At the most they might need to add 1 extra field at the events with most teams attending.
And regarding paint, my team wich ended up 2nd overall just behind Oslo Menace, we did not use any more paint than we would use in D1 Millenium this year if we went all the way to the finals. We have already been playing this format for a year, and this is by far the best format we have ever played regarding the cost and people you need to bring. Xball is a lot more expensive.
Also i think we will see a raise in entry fees for 2007. Just my guess, but its 2 years since they raised it.