Blizzard would never go for that unless the cost was commensurate with the number of members in the guild. Huge loss of revenue for them otherwise.

There is precedent for a lower-price on a mass transfer of toons, and it's seen in something every player has to deal with: the base subscription price. Consider: you can buy one month of gametime for $15, three months for $14 per, or 6 months for $13 per.

For a guild transfer of 100 toons, it wouldn't be unreasonable for the per-toon rate to be reduced from $25 dollars to $22 dollars. Or if a single player could transfer all up-to-10 toons on an account for a $100-150 dollar fee.

They actually probably wouldn't lose money on this, since they'd probably convince people to transfer more toons total. A hypothetical example: Johnny is transferring his Warrior main and his Priest alt along with his guild which is switching servers due to server economics and to increase the pool of potential recruits. Fee: $50. He's got a at-or-near max level hunter, druid, and warlock, but only plays them sometimes and doesn't feel it's worth the effort to transfer them all. If Blizzard offered him a discount where he could transfer all his toons, including his even lower alts in the level 40-70 range, for let's suppose $125, Johnny would, and Blizzard would probably see a higher net profit.

and if it was something like £50 then anyone wanting 4+ characters to move could make a guild specificly for it

Blizzard won't do this (one payment guild transfers), but not nec. Because if the money. Doing this would require users to share account info or otherwise do real-life coordination of all the pages and approvals, which is a huge security issue or just too much work. If you're worried about your GM rage-transferring your guild, just think how much you'd like it if he rage-transfers your toon to another realm (then kicks you for fun). Now Blizzard has modified your account without your consent and things go downhill from there.

I feel that every account should get one free transfer