Its because Evo events are no longer events. People expect them to happen as "business as usual" instead of it being an event, IE an additional thing that doesn't have to be done. Don't get me wrong I love 2x gathering and stuff, but when WC does it every weekend people depend on it and so when they have to deal with normal rates, they QQ.
I personally think they need to up the current server rates a little, make that the standard and stop having the same evo event every weekend.
Event should be things that happen outside of the normal, not the normal. From my POV from what I have seen on the PvE servers I am on, the `standard` 2x event just makes it so people wait til the weekend, then everyone is competing for tames, getting their panties in a twist if someone else gets a tame they wanted (by means of coincidence, not swooping in and getting the last tranq shot), and the atmosphere just becomes toxic.
If 2x (for example) were the norm then they could do more of these odd ball evo events like, a crafting skill buff, loot drop increase, hell how about evo event where dinos (including flyers) all move 10% faster? (I know they would probably break the servers doing that).