Gonna cover a few things.
-entitlement
-source of income
-the difference between something being the teams and something being a lanes
-taxing
-late game buffs
-who can utilize the buff the most
when a laner goes into the jungle and just assumes they can take gromp or krugs because they're bot lane it is very frustrating, you're not entitled to it. They are jungle camps, that are gold for the jungler. And saying they are not the junglers camps, but the teams camps is essentially saying its ok for the jungler to just walk into your lane and take cs whenever he/she wants without reason because they're the teams minions, not your lanes minions. The camps are the junglers source of income like the minions are lanes source of income. Now thats not saying that if the jungler is banking top you can't take krugs, just communicate with your team so that you know you're not going to steal away from your own team, therefore helping the enemy team by not sharing the wealth.
Now if i (the jungler) bank your lane and i get your lane opponents flash, or a kill, but i do not receive the kill and only get an assist, i am going to tax you. I will take a handful of minions, usually around 5-7, because in the time it took me to bank your lane i am giving up farming time in the jungle. This is how the rift keeps everything in balance, but if i come and i don't do anything but get them to back up, ping me away if i try to take farm bc i really didn't do anything to earn the tax. Know what i mean?
for the most part when it comes to buffs after the first 2 maybe 3 buffs it is on the jungler to decide whether or not it is better to have the red buff on the 2/2 sivir or the 4/2 fizz. It comes down to the junglers judgement when it comes down to it, and if the laner wants to take a buff they can very easily ask and most junglers including myself have no problem giving them away.
Now when it comes to very late game 35-40 mins + the buffs then no longer become only the junglers decision and should go to the player on the team carrying the hardest that can make the most use of it and has a lower chance of losing the buff to the other team. That means if the 13/5 sivir thinks she is entitled to the red buff after 50 minutes because she is the adc, she needs to realize that perhaps the red buff and the blue buff would be better suited on the 26/3 fizz that is tanky, deals a lot of damage and has lots of ins and outs to get onto the enemy back line and pop the enemy teams carries, with a devourer to boot. Just because the mid laner uses mana doesn't entitle him/her to the blue buff for the rest of the game, the buffs go to whoever is carrying / whoever will benefit the team the most with it.
Also lanes need to understand that it makes an absolutely ASTOUNDING difference in how you approach getting buffs from your jungler in the late game. If the ashe asks for the blue buff and the annie mid lane doesn't need it, it is much more appreciated and much more likely your jungler will let you have the buff, than if you just take it and then say "oh its better on me now i can keep my frost shot active all the time".
This is also a big deal when you have a team split thinking that the buffs should statically always having red buff go to the adc late game and always having the blue buff go to the mid / top laner late game. This is not true. I will go back to my fizz example since it is fresh in my mind. If i (fizz) am carrying the game and have more than twice as many kills as the adc, am full build and have no reason to go back to base other than to get pots, it makes more sense for me to have the blue and the red buff than it does for the 12/6 annie to have blue, or the 13/5 sivir to have red, because i am constantly spamming spells, am tanky with the new ad fizz tank build (less likely to lose them), and can get to the back line fairly easily and blow up their carries, while the adc with red would still be trying to fight down the frontline, and the annie with blue would not need the increased mana regen for a single fight.
Also if your jungler has built the devourer enchant on his jungle item you should always double check before taking his camps because then not only are the camps his source of income they're his source of damage, even in the late game when everyone is fully built. Similar to nasus, sion, veigar etc that all have infinitely stacking abilities, you can never have enough stacks, and one stack may be the difference between winning a fight or losing a fight, and you have no way to know whether or not it will.
But, as stated above it is all situational, and unless you are fimiliar with the champion and playstyle of the other champs on your team, you cannot definitively say "this buff is best on me". You need t communicate with your teammates and coordinate buffs to help the team and not just yourself.
