I have to respectfully disagree with both of you
It won't do you any good. They aren't being honest about how it works.
Let's compare a 4-person guild to a 40-person guild (because it's easy visual math).
Your goal is to average 250 fights per player (we'll ignore negotiations for simplicity) for a total of 1,000 fights. That would mean an actual 250 fights per player with 100% participation. But one player is sick this week and another player is just lazy -- and so both of them don't do anything at all. So, that means it falls to the other two players to pick up the slack for 500 fights per player... double the effort due to 50% participation.
For the 40-person guild -- the goal being the same -- you're looking for a total of 10,000 fights. Let's say 10 (5x more) of them do nothing at all (damn bums) and another 10 of them are at least able to do half of the goal. That means there's a combined 1,250 fights between those 20 players, leaving 8,750 for the other 20 players. That's still only a 437.50 average left for them to complete in order to achieve that same 50% participation, even though you had 5x more players doing absolutely nothing in your guild.
Yes, these are hypotheticals. But that's how you analyze this sort of thing. You can more easily spread out participation among larger guilds. It's just a fact. You don't have to make up for deficiencies as much as individuals the more people there are to do so. This is an HONEST assessment of how/why participation can be easier when you have a larger guild and why it isn't equally balanced/fair when put up against smaller ones.
There are regularly 15-member guilds put up against 80-member guilds on the maps. If 10 members of a 15-player guild and 10 members of a 80-player guild all go on vacation at the start of a GBg round, the remaining players of each of those guilds will have a much different requirement of them to achieve the same participation. Since all you're evaluating is the participation average of a guild, you're saying it's fair that 70 players can collectively handle the missing 12.5% with the same effort as the guild that has to make up a missing 33%. It doesn't matter if it's hypothetical... it matters that it can happen at all. Allowing for these hypothetical situations at all is poor balancing.