If you think dealing 2k damage in a battle is unobtainable then you shouldnt be playing the t25 pilot. From tier 6 on I personally wouldnt have much trouble achieving 2k damage. At tier 8 if you cant achieve 2k dmg per battle you arent playing well.
Im not saying the that players of a lower skill level shouldnt play higher tiers, but dont expect a hand out if you cant play well enough to earn one of the more valuable prem tanks.
I personally do think that if you cant play well enough to achieve that damage at tier 6-8 you arent doing yourself any favors trying to earn the pilot. Its going to be a bit more of a skill capped play style (less forgiving of a tank when you make mistakes and only good if you know how to use it). Better for you to focus on playing tiers that you feel you can comfortably and consistently do well in until you gain the skills to do the same at higher tiers.
A good rule of thumb is being able to (on avg) deal as much damage as your tank has in HP.
Ok even on tier 7..a T29 will have to kill on his own without help 2 T29s to do the damage...the rest of the team can cheep damage away or the T29 will have to target a 3rd tank...T29 has 1150 HP I think.....so even doing 1.5 more damage than your tank's HP will not do you any good...even if you play awesome and get 0 damage.....you still need to do those 2000 X 10 times in 24 hours...ridiculous. check the Averages for tier 4 to 7 in damage not even on the higher ends...its a rare occasion....doing it 10 times in 1 day...lol....that would be a good video for youtube....if they where gonna make it impossible for tiers 4,5,6 and even 7 then why include them?