you think railway wouldn't have thought about it ? If we people sitting in our home can think about it then railway for sure would have had a think about it
But there would be inherent problems hence not done
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One problem which anyone can clearly think is that booking clerk having to fetch dynamic price every time.
Then...
more... he will ask customer whether he want to book in 3a for x sum.
Customer will say no this price is too high
Can you try and fetch price for sleeper ....
What a tedious process ..... Hardly 5 ticket would be booked in 1 hour...
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And the people who will spend quite a lot of money on premium price would have surely Internet connection with android phone.