The answer is nothing, I was in a small guild with friends and the ones left that still play (all 2 of them) transferred to JQ so I went along with them knowing nothing about the server to find out they owned 95-100% of the map so I would never go into WvW because there was no fun so I transferred to a server a few tiers down and going into WvW is actually fun again. I don’t see why people want to be on those big zerg servers, in my opinion you don’t gain anything from it other than not losing, there is no fun and you will literally run around for hours doing basically nothing.