Nah I like the lively discussions that happen on here. Sometimes you learn something,sometimes you just get to laugh at an hysterical idiot. Either way all good.
Didn't read the whole thread but will say on the hpa thing you are right and wrong. The day warming up will effect fps on airsoft guns as hot air is less dense so you get less drag but not enough to really have much of an affect on a 6mm fraction of a gram spherical ball. Especially when you take into account that the colder air in the morning will be denser which leads to a better push, but again so negligble that it makes a difference that is way below standard fps variation on any airsoft gun. The medium used for hpa is the same as aeg so the outcome would be the same as hpa so limiting only one makes no sense.
The only real argument is gbb as they can climb up in fps from a cold morning to warm aftenoon hugely as the medium used for propulsion reacts to temperature change far more than air.
So people on here are correct the rule is kind of pointless but as it's your site your rules are your choice and if people have an issue then no one forces them to go there.